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31=5(a+7)-4(1+2a)
We simplify the equation to the form, which is simple to understand
31=5(a+7)-4(1+2a)
Reorder the terms in parentheses
31=+(+5a+35)-4*(1+2a)
Remove unnecessary parentheses
+31=+5a+35-4+*(+1+2a+)
Reorder the terms in parentheses
31=+5a+35+(-4-8a)
Remove unnecessary parentheses
+31=+5a+35-4-8a
We move all terms containing a to the left and all other terms to the right.
-5a+8a=+35-4-31
We simplify left and right side of the equation.
+3a=0
We divide both sides of the equation by 3 to get a.
a=0
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