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(2/3)*(10*x-20) = 3 // - 3
(2/3)*(10*x-20)-3 = 0
2/3*(10*x-20)-3 = 0
2/3*(10*x-20)-3 = 0
20/3*x-49/3 = 0
20/3*x-49/3 = 0
20/3*x-49/3 = 0 // + 49/3
20/3*x = 49/3 // : 20/3
x = 49/3/20/3
x = 49/20
x = 49/20
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