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-7a+9a=4(3+2a)-2(a-10)
We simplify the equation to the form, which is simple to understand
-7a+9a=4(3+2a)-2(a-10)
Reorder the terms in parentheses
-7a+9a=+(+12+8a)-2*(a-10)
Remove unnecessary parentheses
-7a+9a=+12+8a-2+*(+a-10+)
Reorder the terms in parentheses
-7a+9a=+12+8a+(-2a+20)
Remove unnecessary parentheses
-7a+9a=+12+8a-2a+20
We move all terms containing a to the left and all other terms to the right.
-7a+9a-8a+2a=+12+20
We simplify left and right side of the equation.
-4a=+32
We divide both sides of the equation by -4 to get a.
a=-8
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