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(2x-5)+(2x+15)=90
We simplify the equation to the form, which is simple to understand
(2x-5)+(2x+15)=90
Remove unnecessary parentheses
2x-5+(2x+15)=90
Remove unnecessary parentheses
+2x-5+2x+15=+90
We move all terms containing x to the left and all other terms to the right.
+2x+2x=+90+5-15
We simplify left and right side of the equation.
+4x=+80
We divide both sides of the equation by 4 to get x.
x=20
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