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x in (-oo:+oo)
(-3/10)*x-7 = 1/2 // - 1/2
(-3/10)*x-(1/2)-7 = 0
(-3/10)*x-1/2-7 = 0
-3/10*x-15/2 = 0 // + 15/2
-3/10*x = 15/2 // : -3/10
x = 15/2/(-3/10)
x = -25
x = -25
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