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5-((2*z)/7) = 13-((2*x)/5) // - 13-((2*x)/5)
(2*x)/5-((2*z)/7)-13+5 = 0
(2*x)/5+(-2/7)*z-13+5 = 0
2/5*x-2/7*z-8 = 0 // + -2/7*z-8
2/5*x = -(-2/7*z-8) // : 2/5
x = (-(-2/7*z-8))/2/5
x = 5/2*(8-(-2/7*z))
x = 5/2*(8-(-2/7*z))
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