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0.5(-3a-7)-0.75(2a)=-a+7
We simplify the equation to the form, which is simple to understand
0.5(-3a-7)-0.75(2a)=-a+7
Reorder the terms in parentheses
+(-1.5a-3.5)-0.75*(2a)=-a+7
Remove unnecessary parentheses
-1.5a-3.5-0.75+*(+2a+)=-a+7
Reorder the terms in parentheses
-1.5a-3.5+(-1.5a)=-a+7
Remove unnecessary parentheses
-1.5a-3.5-1.5a=-a+7
We move all terms containing a to the left and all other terms to the right.
-1.5a-1.5a+1a=+7+3.5
We simplify left and right side of the equation.
-2a=+10.5
We divide both sides of the equation by -2 to get a.
a=-5.25
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