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(5x+50)+40=300
We move all terms to the left:
(5x+50)+40-(300)=0
We add all the numbers together, and all the variables
(5x+50)-260=0
We get rid of parentheses
5x+50-260=0
We add all the numbers together, and all the variables
5x-210=0
We move all terms containing x to the left, all other terms to the right
5x=210
x=210/5
x=42
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