-3x-(1-x)=-15

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Solution for -3x-(1-x)=-15 equation: 



-3x-(1-x)=-15

We move all terms to the left:

-3x-(1-x)-(-15)=0

We add all the numbers together, and all the variables

-3x-(-1x+1)-(-15)=0

We add all the numbers together, and all the variables

-3x-(-1x+1)+15=0

We get rid of parentheses

-3x+1x-1+15=0

We add all the numbers together, and all the variables

-2x+14=0

We move all terms containing x to the left, all other terms to the right

-2x=-14

x=-14/-2

x=+7

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