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x in (-oo:+oo)
(-4/7)*x = -49.23 // + 49.23
(-4/7)*x+49.23 = 0
49.23-4/7*x = 0 // - 49.23
-4/7*x = -49.23 // : -4/7
x = -49.23/(-4/7)
x = 86.15250022
x = 86.15250022
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