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x in (-oo:+oo)
(-3/7)*x-((3/7)*x) = 6/5-(3/5) // - 6/5-(3/5)
(-3/7)*x-((3/7)*x)-(6/5)+3/5 = 0
(-3/7)*x+(-3/7)*x-6/5+3/5 = 0
-6/7*x-3/5 = 0 // + 3/5
-6/7*x = 3/5 // : -6/7
x = 3/5/(-6/7)
x = -7/10
x = -7/10
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