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x in (-oo:+oo)
(-5/7)*x = -40/7 // + -40/7
(-5/7)*x-(-40/7) = 0
(-5/7)*x+40/7 = 0
40/7-5/7*x = 0 // - 40/7
-5/7*x = -40/7 // : -5/7
x = -40/7/(-5/7)
x = 8
x = 8
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