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5x+3(4x+9)=129
We simplify the equation to the form, which is simple to understand
5x+3(4x+9)=129
Reorder the terms in parentheses
5x+(+12x+27)=129
Remove unnecessary parentheses
+5x+12x+27=+129
We move all terms containing x to the left and all other terms to the right.
+5x+12x=+129-27
We simplify left and right side of the equation.
+17x=+102
We divide both sides of the equation by 17 to get x.
x=6
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