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2*x+4 = 5/4-(7*x) // - 5/4-(7*x)
2*x+7*x-(5/4)+4 = 0
2*x+7*x-5/4+4 = 0
9*x+11/4 = 0 // - 11/4
9*x = -11/4 // : 9
x = -11/4/9
x = -11/36
x = -11/36
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