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-((-1/2)*x+(1/7)*x) = (9/2)*x-((4-2*x)/14) // - (9/2)*x-((4-2*x)/14)
(4-2*x)/14-((-1/2)*x)-((1/7)*x)-((9/2)*x) = 0
(4-2*x)/14+(1/2)*x+(-1/7)*x+(-9/2)*x = 0
(4-2*x)/14+x/2-x/7+(-9*x)/2 = 0
(2*7*(4-2*x))/(2*7*14)+(7*14*x)/(2*7*14)+(2*14*(-x))/(2*7*14)+(-9*7*14*x)/(2*7*14) = 0
2*7*(4-2*x)+7*14*x+2*14*(-x)-9*7*14*x = 0
70*x-28*x-882*x+56 = 0
42*x-882*x+56 = 0
56-840*x = 0
(56-840*x)/(2*7*14) = 0
(56-840*x)/(2*7*14) = 0 // * 2*7*14
56-840*x = 0
56-840*x = 0 // - 56
-840*x = -56 // : -840
x = -56/(-840)
x = 1/15
x = 1/15
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