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a+8+3a+2=-2(7a-2)-4(1-4a)
We simplify the equation to the form, which is simple to understand
a+8+3a+2=-2(7a-2)-4(1-4a)
Reorder the terms in parentheses
a+8+3a+2=+(-14a+4)-4*(1-4a)
Remove unnecessary parentheses
+a+8+3a+2=-14a+4-4+*(+1-4a+)
Reorder the terms in parentheses
a+8+3a+2=-14a+4+(-4+16a)
Remove unnecessary parentheses
+a+8+3a+2=-14a+4-4+16a
We move all terms containing a to the left and all other terms to the right.
+1a+3a+14a-16a=+4-4-8-2
We simplify left and right side of the equation.
+2a=-10
We divide both sides of the equation by 2 to get a.
a=-5
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