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x in (-oo:+oo)
(1/8)*(x-21) = (1/7)*(x-24) // - (1/7)*(x-24)
(1/8)*(x-21)-((1/7)*(x-24)) = 0
(1/8)*(x-21)+(-1/7)*(x-24) = 0
1/8*(x-21)-1/7*(x-24) = 0
1/8*(x-21)-1/7*(x-24) = 0
45/56-1/56*x = 0
45/56-1/56*x = 0
45/56-1/56*x = 0 // - 45/56
-1/56*x = -45/56 // : -1/56
x = -45/56/(-1/56)
x = 45
x = 45
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