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-50=-5(-3a+7)-3(1+a)
We simplify the equation to the form, which is simple to understand
-50=-5(-3a+7)-3(1+a)
Reorder the terms in parentheses
-50=+(+15a-35)-3*(1+a)
Remove unnecessary parentheses
-50=+15a-35-3+*(+1+a+)
Reorder the terms in parentheses
-50=+15a-35+(-3-3a)
Remove unnecessary parentheses
-50=+15a-35-3-3a
We move all terms containing a to the left and all other terms to the right.
-15a+3a=-35-3+50
We simplify left and right side of the equation.
-12a=+12
We divide both sides of the equation by -12 to get a.
a=-1
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