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x+(2x+21)=90
We simplify the equation to the form, which is simple to understand
x+(2x+21)=90
Remove unnecessary parentheses
+x+2x+21=+90
We move all terms containing x to the left and all other terms to the right.
+1x+2x=+90-21
We simplify left and right side of the equation.
+3x=+69
We divide both sides of the equation by 3 to get x.
x=23
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