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78=9x-3(-56+12x)
We simplify the equation to the form, which is simple to understand
78=9x-3(-56+12x)
Reorder the terms in parentheses
78=9x+(+168-36x)
Remove unnecessary parentheses
+78=+9x+168-36x
We move all terms containing x to the left and all other terms to the right.
-9x+36x=+168-78
We simplify left and right side of the equation.
+27x=+90
We divide both sides of the equation by 27 to get x.
x=3.33333333333
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