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-7-4x=7x-40
We move all terms to the left:
-7-4x-(7x-40)=0
We get rid of parentheses
-4x-7x+40-7=0
We add all the numbers together, and all the variables
-11x+33=0
We move all terms containing x to the left, all other terms to the right
-11x=-33
x=-33/-11
x=+3
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