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3*x-((20-(4*x))/2) = 0
3*x-((20-4*x)/2) = 0
(-1*(20-4*x))/2+3*x = 0
(-1*(20-4*x))/2+(2*3*x)/2 = 0
2*3*x-1*(20-4*x) = 0
10*x-20 = 0
(10*x-20)/2 = 0
(10*x-20)/2 = 0 // * 2
10*x-20 = 0
10*x-20 = 0 // + 20
10*x = 20 // : 10
x = 20/10
x = 2
x = 2
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