7x-12x=-40+15

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Solution for 7x-12x=-40+15 equation: 



7x-12x=-40+15

We move all terms to the left:

7x-12x-(-40+15)=0

We add all the numbers together, and all the variables

7x-12x-(-25)=0

We add all the numbers together, and all the variables

-5x+25=0

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

-5x=-25

x=-25/-5

x=+5

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