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(-1/5)*x+4 = 47/12 // - 47/12
(-1/5)*x-(47/12)+4 = 0
(-1/5)*x-47/12+4 = 0
1/12-1/5*x = 0 // - 1/12
-1/5*x = -1/12 // : -1/5
x = -1/12/(-1/5)
x = 5/12
x = 5/12
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