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(90+x)+x=180
We simplify the equation to the form, which is simple to understand
(90+x)+x=180
Remove unnecessary parentheses
90+x+x=180
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+180-90
We simplify left and right side of the equation.
+2x=+90
We divide both sides of the equation by 2 to get x.
x=45
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