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x in (-oo:+oo)
(-2/3)*x-((4/5)*x)+2/7 = -64/315 // + -64/315
(-2/3)*x-((4/5)*x)+2/7-(-64/315) = 0
(-2/3)*x+(-4/5)*x+2/7+64/315 = 0
22/45-22/15*x = 0 // - 22/45
-22/15*x = -22/45 // : -22/15
x = -22/45/(-22/15)
x = 1/3
x = 1/3
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