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x in (-oo:+oo)
(-2/7)*x-((2/5)*x)-3 = -39/5 // + -39/5
(-2/7)*x-((2/5)*x)-(-39/5)-3 = 0
(-2/7)*x+(-2/5)*x+39/5-3 = 0
24/5-24/35*x = 0 // - 24/5
-24/35*x = -24/5 // : -24/35
x = -24/5/(-24/35)
x = 7
x = 7
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