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0.4x-1.5(x-1)=7
We move all terms to the left:
0.4x-1.5(x-1)-(7)=0
We multiply parentheses
0.4x-1.5x+1.5-7=0
We add all the numbers together, and all the variables
-1.1x-5.5=0
We move all terms containing x to the left, all other terms to the right
-1.1x=5.5
x=5.5/-1.1
x=-5
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