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4x-7=-3x-21
We move all terms to the left:
4x-7-(-3x-21)=0
We get rid of parentheses
4x+3x+21-7=0
We add all the numbers together, and all the variables
7x+14=0
We move all terms containing x to the left, all other terms to the right
7x=-14
x=-14/7
x=-2
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