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(15x+3)+(5x-13)=90
We simplify the equation to the form, which is simple to understand
(15x+3)+(5x-13)=90
Remove unnecessary parentheses
15x+3+(5x-13)=90
Remove unnecessary parentheses
+15x+3+5x-13=+90
We move all terms containing x to the left and all other terms to the right.
+15x+5x=+90-3+13
We simplify left and right side of the equation.
+20x=+100
We divide both sides of the equation by 20 to get x.
x=5
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