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4-21x-7=-4x+2
We move all terms to the left:
4-21x-7-(-4x+2)=0
We add all the numbers together, and all the variables
-21x-(-4x+2)-3=0
We get rid of parentheses
-21x+4x-2-3=0
We add all the numbers together, and all the variables
-17x-5=0
We move all terms containing x to the left, all other terms to the right
-17x=5
x=5/-17
x=-5/17
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