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(4/5)*x-((33/4)*x) = 21/2 // - 21/2
(4/5)*x-((33/4)*x)-(21/2) = 0
(4/5)*x+(-33/4)*x-21/2 = 0
-149/20*x-21/2 = 0 // + 21/2
-149/20*x = 21/2 // : -149/20
x = 21/2/(-149/20)
x = -210/149
x = -210/149
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