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20 = 7*x+5*x+9/4+9/8 // - 7*x+5*x+9/4+9/8
20-(7*x)-(5*x)-(9/4)-(9/8) = 0
20-7*x-5*x-9/4-9/8 = 0
133/8-12*x = 0 // - 133/8
-12*x = -133/8 // : -12
x = -133/8/(-12)
x = 133/96
x = 133/96
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