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0.6x+0.2(40-x)=0
We add all the numbers together, and all the variables
0.6x+0.2(-1x+40)=0
We multiply parentheses
0.6x-0.2x+8=0
We add all the numbers together, and all the variables
0.4x+8=0
We move all terms containing x to the left, all other terms to the right
0.4x=-8
x=-8/0.4
x=-20
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