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(-2/5)*x+2/3 = (3/7)*x-160/21 // - (3/7)*x-160/21
(-2/5)*x-((3/7)*x)+2/3-(-160/21) = 0
(-2/5)*x+(-3/7)*x+2/3+160/21 = 0
58/7-29/35*x = 0 // - 58/7
-29/35*x = -58/7 // : -29/35
x = -58/7/(-29/35)
x = 10
x = 10
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