Answer
$x=-2$
Work Step by Step
$3x+2x+64=40-7x$
$5x+64=40-7x$
$5x+7x+64=40$
$12x+64=40$
$12x=40-64$
$12x=-24$
$x=\frac{-24}{12}$
$x=-2$
Check the answer.
3(-2)+2(-2)+64=40-7(-2)
-6+(-4)+64=40-(-14)
-10+64=40+14
54=54
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