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56 = (4/7)*x // - (4/7)*x
56-((4/7)*x) = 0
(-4/7)*x+56 = 0
56-4/7*x = 0 // - 56
-4/7*x = -56 // : -4/7
x = -56/(-4/7)
x = 98
x = 98
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