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4=12-10x
We move all terms to the left:
4-(12-10x)=0
We add all the numbers together, and all the variables
-(-10x+12)+4=0
We get rid of parentheses
10x-12+4=0
We add all the numbers together, and all the variables
10x-8=0
We move all terms containing x to the left, all other terms to the right
10x=8
x=8/10
x=4/5
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