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-4x-40=3x-30
We move all terms to the left:
-4x-40-(3x-30)=0
We get rid of parentheses
-4x-3x+30-40=0
We add all the numbers together, and all the variables
-7x-10=0
We move all terms containing x to the left, all other terms to the right
-7x=10
x=10/-7
x=-1+3/7
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