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36=-3x-4x
We move all terms to the left:
36-(-3x-4x)=0
We add all the numbers together, and all the variables
-(-7x)+36=0
We get rid of parentheses
7x+36=0
We move all terms containing x to the left, all other terms to the right
7x=-36
x=-36/7
x=-5+1/7
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