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40=4-4x
We move all terms to the left:
40-(4-4x)=0
We add all the numbers together, and all the variables
-(-4x+4)+40=0
We get rid of parentheses
4x-4+40=0
We add all the numbers together, and all the variables
4x+36=0
We move all terms containing x to the left, all other terms to the right
4x=-36
x=-36/4
x=-9
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