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5*x-20 = (1/2)*(4*x-4) // - (1/2)*(4*x-4)
5*x-((1/2)*(4*x-4))-20 = 0
(-1/2)*(4*x-4)+5*x-20 = 0
5*x-1/2*(4*x-4)-20 = 0
5*x-1/2*(4*x-4)-20 = 0
3*x-20+2 = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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