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56/15 = (-2/5)*x-((1/3)*x)+3 // - (-2/5)*x-((1/3)*x)+3
(1/3)*x-((-2/5)*x)+56/15-3 = 0
(2/5)*x+(1/3)*x+56/15-3 = 0
11/15*x+11/15 = 0 // - 11/15
11/15*x = -11/15 // : 11/15
x = -11/15/11/15
x = -1
x = -1
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