[Toán 6] Tìm x thuộc Z

H

hocvuima

$-5x+9-(3x-8)=2x+8-(x-18)$
$-5x+9-3x+8=2x+8-x+18$
$-8x+17=x+26$
$17=9x+26$
$-9=9x$
$-1=x$
Đáp số:$x=-1$
 
T

thangvegeta1604

$-5x+9-(3x-8)=2x+8-(x-18)$
\Leftrightarrow $-5x+9-3x+8=2x+8-x+18$
\Leftrightarrow $-8x+17=x+26$
\Leftrightarrow $-8x-x=26-17$
\Leftrightarrow $-9x=9$
\Leftrightarrow $x=-1$
Vậy x=-1.
 
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