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10+20x+(-10)=15x-5x+90
We simplify the equation to the form, which is simple to understand
10+20x+(-10)=15x-5x+90
Remove unnecessary parentheses
+10+20x-10=+15x-5x+90
We move all terms containing x to the left and all other terms to the right.
+20x-15x+5x=+90-10+10
We simplify left and right side of the equation.
+10x=+90
We divide both sides of the equation by 10 to get x.
x=9
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