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0.15(x+60)-0.08(x-20)=6.4
We move all terms to the left:
0.15(x+60)-0.08(x-20)-(6.4)=0
We add all the numbers together, and all the variables
0.15(x+60)-0.08(x-20)-6.4=0
We multiply parentheses
0.15x-0.08x+9+1.6-6.4=0
We add all the numbers together, and all the variables
0.07x+4.2=0
We move all terms containing x to the left, all other terms to the right
0.07x=-4.2
x=-4.2/0.07
x=-60
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