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(18+x)+x=228
We simplify the equation to the form, which is simple to understand
(18+x)+x=228
Remove unnecessary parentheses
18+x+x=228
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+228-18
We simplify left and right side of the equation.
+2x=+210
We divide both sides of the equation by 2 to get x.
x=105
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