4x-5x=7+5

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Solution for 4x-5x=7+5 equation: 



4x-5x=7+5

We move all terms to the left:

4x-5x-(7+5)=0

We add all the numbers together, and all the variables

4x-5x-12=0

We add all the numbers together, and all the variables

-1x-12=0

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

-x=12

x=12/-1

x=-12

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