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5x-4=77-4x
We move all terms to the left:
5x-4-(77-4x)=0
We add all the numbers together, and all the variables
5x-(-4x+77)-4=0
We get rid of parentheses
5x+4x-77-4=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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