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x in (-oo:+oo)
(-30*x)/8 = -2 // + 2
(-30*x)/8+2 = 0
2-15/4*x = 0 // - 2
-15/4*x = -2 // : -15/4
x = -2/(-15/4)
x = 8/15
x = 8/15
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