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(3/2)*a+(5/4)*a-((7/8)*a) = 33-18 // - 33-18
(3/2)*a+(5/4)*a-((7/8)*a)-33+18 = 0
(3/2)*a+(5/4)*a+(-7/8)*a-33+18 = 0
15/8*a-15 = 0 // + 15
15/8*a = 15 // : 15/8
a = 15/15/8
a = 8
a = 8
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