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5(3x-0.4)=28
We move all terms to the left:
5(3x-0.4)-(28)=0
We multiply parentheses
15x-2-28=0
We add all the numbers together, and all the variables
15x-30=0
We move all terms containing x to the left, all other terms to the right
15x=30
x=30/15
x=2
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