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4x+2(5x-15)=138
We simplify the equation to the form, which is simple to understand
4x+2(5x-15)=138
Reorder the terms in parentheses
4x+(+10x-30)=138
Remove unnecessary parentheses
+4x+10x-30=+138
We move all terms containing x to the left and all other terms to the right.
+4x+10x=+138+30
We simplify left and right side of the equation.
+14x=+168
We divide both sides of the equation by 14 to get x.
x=12
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