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12a-3(3a-2)+4=7a-4(a-2)
We simplify the equation to the form, which is simple to understand
12a-3(3a-2)+4=7a-4(a-2)
Reorder the terms in parentheses
12a+(-9a+6)+4=7a-4*(a-2)
Remove unnecessary parentheses
+12a-9a+6+4=+7a-4+*(+a-2+)
Reorder the terms in parentheses
12a-9a+6+4=7a+(-4a+8)
Remove unnecessary parentheses
+12a-9a+6+4=+7a-4a+8
We move all terms containing a to the left and all other terms to the right.
+12a-9a-7a+4a=+8-6-4
We simplify left and right side of the equation.
a=-2
0=-2
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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