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C in (-oo:+oo)
(1/4)*(C-30) = 15 // - 15
(1/4)*(C-30)-15 = 0
1/4*(C-30)-15 = 0
1/4*(C-30)-15 = 0
1/4*C-45/2 = 0
1/4*C-45/2 = 0
1/4*C-45/2 = 0 // + 45/2
1/4*C = 45/2 // : 1/4
C = 45/2/1/4
C = 90
C = 90
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