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130+(x+40)=180
We move all terms to the left:
130+(x+40)-(180)=0
We add all the numbers together, and all the variables
(x+40)-50=0
We get rid of parentheses
x+40-50=0
We add all the numbers together, and all the variables
x-10=0
We move all terms containing x to the left, all other terms to the right
x=10
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