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3*x-16 = (5*x-20)/2 // - (5*x-20)/2
3*x-((5*x-20)/2)-16 = 0
(-1*(5*x-20))/2+3*x-16 = 0
(-1*(5*x-20))/2+(2*3*x)/2+(-16*2)/2 = 0
2*3*x-1*(5*x-20)-16*2 = 0
x-32+20 = 0
x-12 = 0
(x-12)/2 = 0
(x-12)/2 = 0 // * 2
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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