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4-((3/7)*x) = -56 // + 56
4-((3/7)*x)+56 = 0
(-3/7)*x+4+56 = 0
60-3/7*x = 0 // - 60
-3/7*x = -60 // : -3/7
x = -60/(-3/7)
x = 140
x = 140
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