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(15+x)+30=54
We simplify the equation to the form, which is simple to understand
(15+x)+30=54
Remove unnecessary parentheses
15+x+30=54
We move all terms containing x to the left and all other terms to the right.
+1x=+54-15-30
We simplify left and right side of the equation.
+1x=+9
We divide both sides of the equation by 1 to get x.
x=9
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