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X+9X/5=84
We move all terms to the left:
X+9X/5-(84)=0
We multiply all the terms by the denominator
X*5+9X-84*5=0
We add all the numbers together, and all the variables
9X+X*5-420=0
Wy multiply elements
9X+5X-420=0
We add all the numbers together, and all the variables
14X-420=0
We move all terms containing X to the left, all other terms to the right
14X=420
X=420/14
X=30
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