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2+4(39-x)=66
We simplify the equation to the form, which is simple to understand
2+4(39-x)=66
Reorder the terms in parentheses
2+(+156-4x)=66
Remove unnecessary parentheses
+2+156-4x=+66
We move all terms containing x to the left and all other terms to the right.
-4x=+66-2-156
We simplify left and right side of the equation.
-4x=-92
We divide both sides of the equation by -4 to get x.
x=23
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