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25=7+4x
We move all terms to the left:
25-(7+4x)=0
We add all the numbers together, and all the variables
-(4x+7)+25=0
We get rid of parentheses
-4x-7+25=0
We add all the numbers together, and all the variables
-4x+18=0
We move all terms containing x to the left, all other terms to the right
-4x=-18
x=-18/-4
x=4+1/2
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