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x in (-oo:+oo)
(-4/7)*x = -5/2 // + -5/2
(-4/7)*x-(-5/2) = 0
(-4/7)*x+5/2 = 0
5/2-4/7*x = 0 // - 5/2
-4/7*x = -5/2 // : -4/7
x = -5/2/(-4/7)
x = 35/8
x = 35/8
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