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(2/5)*x+3*x+4 = 47/50 // - 47/50
(2/5)*x+3*x-(47/50)+4 = 0
(2/5)*x+3*x-47/50+4 = 0
17/5*x+153/50 = 0 // - 153/50
17/5*x = -153/50 // : 17/5
x = -153/50/17/5
x = -9/10
x = -9/10
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