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0.4(5+x)=4
We move all terms to the left:
0.4(5+x)-(4)=0
We add all the numbers together, and all the variables
0.4(x+5)-4=0
We multiply parentheses
0.4x+2-4=0
We add all the numbers together, and all the variables
0.4x-2=0
We move all terms containing x to the left, all other terms to the right
0.4x=2
x=2/0.4
x=5
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