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30-0.80x=14-1.20x

We move all terms to the left:

30-0.80x-(14-1.20x)=0

We add all the numbers together, and all the variables

-0.80x-(-1.2x+14)+30=0

We add all the numbers together, and all the variables

-0.8x-(-1.2x+14)+30=0

We get rid of parentheses

-0.8x+1.2x-14+30=0

We add all the numbers together, and all the variables

0.4x+16=0

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

0.4x=-16

x=-16/0.4

x=-40

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