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7x-1.8=-4x+0.4
We move all terms to the left:
7x-1.8-(-4x+0.4)=0
We get rid of parentheses
7x+4x-0.4-1.8=0
We add all the numbers together, and all the variables
11x-2.2=0
We move all terms containing x to the left, all other terms to the right
11x=2.2
x=2.2/11
x=2.2/11
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