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c in (-oo:+oo)
(3/4)*c-15 = (9/5)*c-2 // - (9/5)*c-2
(3/4)*c-((9/5)*c)-15+2 = 0
(3/4)*c+(-9/5)*c-15+2 = 0
-21/20*c-13 = 0 // + 13
-21/20*c = 13 // : -21/20
c = 13/(-21/20)
c = -260/21
c = -260/21
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