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x(-3.0)=-36
We move all terms to the left:
x(-3.0)-(-36)=0
We add all the numbers together, and all the variables
x(-3)-(-36)=0
We add all the numbers together, and all the variables
x(-3)+36=0
We multiply parentheses
-3x+36=0
We move all terms containing x to the left, all other terms to the right
-3x=-36
x=-36/-3
x=+12
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