70-1x=100-2.5x

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Solution for 70-1x=100-2.5x equation: 



70-1x=100-2.5x

We move all terms to the left:

70-1x-(100-2.5x)=0

We add all the numbers together, and all the variables

-1x-(-2.5x+100)+70=0

We get rid of parentheses

-1x+2.5x-100+70=0

We add all the numbers together, and all the variables

1.5x-30=0

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

1.5x=30

x=30/1.5

x=20

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