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15-x=4x.x
We move all terms to the left:
15-x-(4x.x)=0
We add all the numbers together, and all the variables
-x-(+4x.x)+15=0
We add all the numbers together, and all the variables
-1x-(+4x.x)+15=0
We get rid of parentheses
-1x-4x.x+15=0
We move all terms containing x to the left, all other terms to the right
-1x-4x.x=-15
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