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12/7 = 2*x+(2/5)*x-1 // - 2*x+(2/5)*x-1
12/7-(2*x)-((2/5)*x)+1 = 0
(-2/5)*x-2*x+12/7+1 = 0
19/7-12/5*x = 0 // - 19/7
-12/5*x = -19/7 // : -12/5
x = -19/7/(-12/5)
x = 95/84
x = 95/84
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