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(22-x)+(17-x)+x+8=30
We move all terms to the left:
(22-x)+(17-x)+x+8-(30)=0
We add all the numbers together, and all the variables
(-1x+22)+(-1x+17)+x+8-30=0
We add all the numbers together, and all the variables
x+(-1x+22)+(-1x+17)-22=0
We get rid of parentheses
x-1x-1x+22+17-22=0
We add all the numbers together, and all the variables
-1x+17=0
We move all terms containing x to the left, all other terms to the right
-x=-17
x=-17/-1
x=+17
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