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(1/4)*(4*x-80) = 20-(3*x) // - 20-(3*x)
(1/4)*(4*x-80)+3*x-20 = 0
1/4*(4*x-80)+3*x-20 = 0
1/4*(4*x-80)+3*x-20 = 0
4*x-20-20 = 0
4*x-40 = 0
4*x-40 = 0
4*x-40 = 0 // + 40
4*x = 40 // : 4
x = 40/4
x = 10
x = 10
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