.90x=70+.40x

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Solution for .90x=70+.40x equation: 



.90x=70+.40x

We move all terms to the left:

.90x-(70+.40x)=0

We add all the numbers together, and all the variables

.90x-(.40x+70)=0

We get rid of parentheses

.90x-.40x-70=0

We add all the numbers together, and all the variables

0.5x-70=0

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

0.5x=70

x=70/0.5

x=140

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