7x-1.8=-4x=0.4

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Solution for 7x-1.8=-4x=0.4 equation: 



7x-1.8=-4x=0.4

We move all terms to the left:

7x-1.8-(-4x)=0

We get rid of parentheses

7x+4x-1.8=0

We add all the numbers together, and all the variables

11x-1.8=0

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

11x=1.8

x=1.8/11

x=1/6.11111111111

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