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(25*x)/5-(7*x) = 12 // - 12
(25*x)/5-(7*x)-12 = 0
(25*x)/5-7*x-12 = 0
-2*x-12 = 0 // + 12
-2*x = 12 // : -2
x = 12/(-2)
x = -6
x = -6
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