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0.8(x-5)+4-0.4x=40
We move all terms to the left:
0.8(x-5)+4-0.4x-(40)=0
We add all the numbers together, and all the variables
-0.4x+0.8(x-5)-36=0
We multiply parentheses
-0.4x+0.8x-4-36=0
We add all the numbers together, and all the variables
0.4x-40=0
We move all terms containing x to the left, all other terms to the right
0.4x=40
x=40/0.4
x=100
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