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12-x+4x=10-3
We move all terms to the left:
12-x+4x-(10-3)=0
We add all the numbers together, and all the variables
-x+4x+12-7=0
We add all the numbers together, and all the variables
3x+5=0
We move all terms containing x to the left, all other terms to the right
3x=-5
x=-5/3
x=-1+2/3
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