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x+2x+(x-7)=77
We simplify the equation to the form, which is simple to understand
x+2x+(x-7)=77
Remove unnecessary parentheses
+x+2x+x-7=+77
We move all terms containing x to the left and all other terms to the right.
+1x+2x+1x=+77+7
We simplify left and right side of the equation.
+4x=+84
We divide both sides of the equation by 4 to get x.
x=21
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