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x/4+21=18
We move all terms to the left:
x/4+21-(18)=0
We add all the numbers together, and all the variables
x/4+3=0
We multiply all the terms by the denominator
x+3*4=0
We add all the numbers together, and all the variables
x+12=0
We move all terms containing x to the left, all other terms to the right
x=-12
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