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x in (-oo:+oo)
(-7/20)*x = 2 // - 2
(-7/20)*x-2 = 0
-7/20*x-2 = 0 // + 2
-7/20*x = 2 // : -7/20
x = 2/(-7/20)
x = -40/7
x = -40/7
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