120+.40x=30+.70x

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Solution for 120+.40x=30+.70x equation: 



120+.40x=30+.70x

We move all terms to the left:

120+.40x-(30+.70x)=0

We add all the numbers together, and all the variables

.40x-(.70x+30)+120=0

We get rid of parentheses

.40x-.70x-30+120=0

We add all the numbers together, and all the variables

-0.3x+90=0

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

-0.3x=-90

x=-90/-0.3

x=+300

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