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(-4/5)*x+10 = 512/35-((2/7)*x) // - 512/35-((2/7)*x)
(-4/5)*x+(2/7)*x-(512/35)+10 = 0
(-4/5)*x+(2/7)*x-512/35+10 = 0
-18/35*x-162/35 = 0 // + 162/35
-18/35*x = 162/35 // : -18/35
x = 162/35/(-18/35)
x = -9
x = -9
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