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(2x+9)+(2x+9)+(x-5)+(x-5)=50
We move all terms to the left:
(2x+9)+(2x+9)+(x-5)+(x-5)-(50)=0
We get rid of parentheses
2x+2x+x+x+9+9-5-5-50=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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