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(7/8)*x-3 = 2*x-15 // - 2*x-15
(7/8)*x-(2*x)-3+15 = 0
(7/8)*x-2*x-3+15 = 0
12-9/8*x = 0 // - 12
-9/8*x = -12 // : -9/8
x = -12/(-9/8)
x = 32/3
x = 32/3
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