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3x/8=-21
We move all terms to the left:
3x/8-(-21)=0
We add all the numbers together, and all the variables
3x/8+21=0
We multiply all the terms by the denominator
3x+21*8=0
We add all the numbers together, and all the variables
3x+168=0
We move all terms containing x to the left, all other terms to the right
3x=-168
x=-168/3
x=-56
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