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(4*x)/7 = (6*x)/7-28 // - (6*x)/7-28
(4*x)/7-((6*x)/7)+28 = 0
(4*x)/7+(-6/7)*x+28 = 0
28-2/7*x = 0 // - 28
-2/7*x = -28 // : -2/7
x = -28/(-2/7)
x = 98
x = 98
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