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30x+55=49x-2
We move all terms to the left:
30x+55-(49x-2)=0
We get rid of parentheses
30x-49x+2+55=0
We add all the numbers together, and all the variables
-19x+57=0
We move all terms containing x to the left, all other terms to the right
-19x=-57
x=-57/-19
x=+3
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