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x in (-oo:+oo)
(-7/10)*x = 5 // - 5
(-7/10)*x-5 = 0
-7/10*x-5 = 0 // + 5
-7/10*x = 5 // : -7/10
x = 5/(-7/10)
x = -50/7
x = -50/7
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