30x-40=10x+100

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Solution for 30x-40=10x+100 equation: 



30x-40=10x+100

We move all terms to the left:

30x-40-(10x+100)=0

We get rid of parentheses

30x-10x-100-40=0

We add all the numbers together, and all the variables

20x-140=0

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

20x=140

x=140/20

x=7

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