30x=31x-15

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Solution for 30x=31x-15 equation: 



30x=31x-15

We move all terms to the left:

30x-(31x-15)=0

We get rid of parentheses

30x-31x+15=0

We add all the numbers together, and all the variables

-1x+15=0

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

-x=-15

x=-15/-1

x=+15

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