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12xx=4/7
We move all terms to the left:
12xx-(4/7)=0
We add all the numbers together, and all the variables
12xx-(+4/7)=0
We get rid of parentheses
12xx-4/7=0
We multiply all the terms by the denominator
12xx*7-4=0
Wy multiply elements
84x-4=0
We move all terms containing x to the left, all other terms to the right
84x=4
x=4/84
x=1/21
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