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(30x+25x)=440
We move all terms to the left:
(30x+25x)-(440)=0
We add all the numbers together, and all the variables
(+55x)-440=0
We get rid of parentheses
55x-440=0
We move all terms containing x to the left, all other terms to the right
55x=440
x=440/55
x=8
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