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126=7x-49
We move all terms to the left:
126-(7x-49)=0
We get rid of parentheses
-7x+49+126=0
We add all the numbers together, and all the variables
-7x+175=0
We move all terms containing x to the left, all other terms to the right
-7x=-175
x=-175/-7
x=+25
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