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x+(12+x)=150
We simplify the equation to the form, which is simple to understand
x+(12+x)=150
Remove unnecessary parentheses
+x+12+x=+150
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+150-12
We simplify left and right side of the equation.
+2x=+138
We divide both sides of the equation by 2 to get x.
x=69
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