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7(d+6)=4(d-7)+3d
We simplify the equation to the form, which is simple to understand
7(d+6)=4(d-7)+3d
Reorder the terms in parentheses
+(+7d+42)=4*(d-7)+3d
Remove unnecessary parentheses
+7d+42=+4+*(+d-7+)+3d
Reorder the terms in parentheses
+7d+42=+(+4d-28)+3d
Remove unnecessary parentheses
+7d+42=+4d-28+3d
We move all terms containing d to the left and all other terms to the right.
+7d-4d-3d=-28-42
We simplify left and right side of the equation.
d=-70
0=-70
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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