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(x+5)+(2x+15)+(2x+10)=90
We simplify the equation to the form, which is simple to understand
(x+5)+(2x+15)+(2x+10)=90
Remove unnecessary parentheses
x+5+(2x+15)+(2x+10)=90
Remove unnecessary parentheses
+x+5+2x+15+(+2x+10+)=+90
Remove unnecessary parentheses
+x+5+2x+15+2x+10=+90
We move all terms containing x to the left and all other terms to the right.
+1x+2x+2x=+90-5-15-10
We simplify left and right side of the equation.
+5x=+60
We divide both sides of the equation by 5 to get x.
x=12
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