15x=20x-40

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Solution for 15x=20x-40 equation: 



15x=20x-40

We move all terms to the left:

15x-(20x-40)=0

We get rid of parentheses

15x-20x+40=0

We add all the numbers together, and all the variables

-5x+40=0

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

-5x=-40

x=-40/-5

x=+8

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