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(1/5)*x+7 = 56/5-(4*x) // - 56/5-(4*x)
(1/5)*x+4*x-(56/5)+7 = 0
(1/5)*x+4*x-56/5+7 = 0
21/5*x-21/5 = 0 // + 21/5
21/5*x = 21/5 // : 21/5
x = 21/5/21/5
x = 1
x = 1
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