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x in (-oo:+oo)
(-9/2)*x-(8/7) = -7/5 // + -7/5
(-9/2)*x-(8/7)-(-7/5) = 0
(-9/2)*x-8/7+7/5 = 0
9/35-9/2*x = 0 // - 9/35
-9/2*x = -9/35 // : -9/2
x = -9/35/(-9/2)
x = 2/35
x = 2/35
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