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x+(3+x)+(6+x)=51
We simplify the equation to the form, which is simple to understand
x+(3+x)+(6+x)=51
Remove unnecessary parentheses
+x+3+x+(+6+x+)=+51
Remove unnecessary parentheses
+x+3+x+6+x=+51
We move all terms containing x to the left and all other terms to the right.
+1x+1x+1x=+51-3-6
We simplify left and right side of the equation.
+3x=+42
We divide both sides of the equation by 3 to get x.
x=14
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