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10(9-10x)-6(12-15x)=-12
We move all terms to the left:
10(9-10x)-6(12-15x)-(-12)=0
We add all the numbers together, and all the variables
10(-10x+9)-6(-15x+12)-(-12)=0
We add all the numbers together, and all the variables
10(-10x+9)-6(-15x+12)+12=0
We multiply parentheses
-100x+90x+90-72+12=0
We add all the numbers together, and all the variables
-10x+30=0
We move all terms containing x to the left, all other terms to the right
-10x=-30
x=-30/-10
x=+3
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