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c in (-oo:+oo)
(2/3)*(c-30) = 4 // - 4
(2/3)*(c-30)-4 = 0
2/3*(c-30)-4 = 0
2/3*(c-30)-4 = 0
2/3*c-24 = 0
2/3*c-24 = 0
2/3*c-24 = 0 // + 24
2/3*c = 24 // : 2/3
c = 24/2/3
c = 36
c = 36
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