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x in (-oo:+oo)
(x-1)/21 = 32/24 // - 32/24
(x-1)/21-(32/24) = 0
(x-1)/21-4/3 = 0
(3*(x-1))/(3*21)+(-4*21)/(3*21) = 0
3*(x-1)-4*21 = 0
3*x-87 = 0
(3*x-87)/(3*21) = 0
(3*x-87)/(3*21) = 0 // * 3*21
3*x-87 = 0
3*x-87 = 0 // + 87
3*x = 87 // : 3
x = 87/3
x = 29
x = 29
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