x+(20+x)=90

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Solution for x+(20+x)=90 equation:


x+(20+x)=90

We simplify the equation to the form, which is simple to understand 
x+(20+x)=90

Remove unnecessary parentheses
+x+20+x=+90

We move all terms containing x to the left and all other terms to the right. 
+1x+1x=+90-20

We simplify left and right side of the equation. 
+2x=+70

We divide both sides of the equation by 2 to get x. 
x=35

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