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42=x/4+6
We move all terms to the left:
42-(x/4+6)=0
We get rid of parentheses
-x/4-6+42=0
We multiply all the terms by the denominator
-x-6*4+42*4=0
We add all the numbers together, and all the variables
-1x+144=0
We move all terms containing x to the left, all other terms to the right
-x=-144
x=-144/-1
x=+144
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