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(x+20)+(2x+9)=90
We simplify the equation to the form, which is simple to understand
(x+20)+(2x+9)=90
Remove unnecessary parentheses
x+20+(2x+9)=90
Remove unnecessary parentheses
+x+20+2x+9=+90
We move all terms containing x to the left and all other terms to the right.
+1x+2x=+90-20-9
We simplify left and right side of the equation.
+3x=+61
We divide both sides of the equation by 3 to get x.
x=20.3333333333
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