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396=12*7x
We move all terms to the left:
396-(12*7x)=0
We add all the numbers together, and all the variables
-(+12*7x)+396=0
We get rid of parentheses
-12*7x+396=0
Wy multiply elements
-84x+396=0
We move all terms containing x to the left, all other terms to the right
-84x=-396
x=-396/-84
x=4+5/7
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