-2(2x-8)+3(4-2x)=-72-5(3x-7)

-2.2x-(-2).8+3.4-3.2x=-72-5.3x+5.7

-4x+16+12-6x=-72-15x+35

-4x-6x+15x=-72+35-16-12

5x=-65

x=-65:5

x=-13

\(-2\left(2x-8\right)+3\left(4-2x\right)=-72-5\left(3x-7\right)\)

\(\Leftrightarrow-4x-16+12-6x=-72-15x+35\)

\(\Leftrightarrow-10x-4=-37-15x\)

\(\Leftrightarrow-10x+15x=-37+4\)

\(\Leftrightarrow5x=-33\)

\(\Leftrightarrow x=\frac{-33}{5}\)

a) $(15-x)+(x-12)=7-(-8+x)$

$15-x+x-12=7+8-x$

$3=15-x$

$x=12$

Vậy $x=12$.

b) $3(x+2)-6(x-5)=2(5-2x)$

$3x+6-6x+30=10-4x$

$-3x+36=10-4x$

$x=-26$

Vậy $x=-26$.

8: =>2x=210

hay x=105

6567578.X.6567578.Y:6098+6099+......+10000=200000000

                                                                    Bài giải

a, \(-2\left(2x-8\right)+3\left(4-2x\right)=-72-5\left(3x-7\right)\)

\(-4x+8+12-6x=-72-15x+7\)

\(-10x+20=-65-15x\)

\(-10x+15x=-65-20\)

\(5x=-85\)

\(x=-85\text{ : }5\)

\(x=-17\)

b, \(3\left|2x^2-7\right|=33\)

\(\left|2x^2-7\right|=33\text{ : }3\)

\(\left|2x^2-7\right|=11\)

\(\Rightarrow\orbr{\begin{cases}2x^2-7=-11\\2x^2-7=11\end{cases}}\Rightarrow\orbr{\begin{cases}2x^2=-4\text{ ( loại ) }\\2x^2=18\end{cases}}\Rightarrow\text{ }x^2=9\text{ }\Rightarrow\text{ }x=\pm3\)

\(\Rightarrow\text{ }x=\pm3\)

cho mk cách lm nha