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(-5/7)*x+(2/3)*x+1 = 41/42 // - 41/42
(-5/7)*x+(2/3)*x-(41/42)+1 = 0
(-5/7)*x+(2/3)*x-41/42+1 = 0
1/42-1/21*x = 0 // - 1/42
-1/21*x = -1/42 // : -1/21
x = -1/42/(-1/21)
x = 1/2
x = 1/2
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