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25=7x-31
We move all terms to the left:
25-(7x-31)=0
We get rid of parentheses
-7x+31+25=0
We add all the numbers together, and all the variables
-7x+56=0
We move all terms containing x to the left, all other terms to the right
-7x=-56
x=-56/-7
x=+8
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