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(2.5*x-7.5)/2.5-((28-(14*x))/7) = 0
(2.5*x-7.5)/2.5-((28-14*x)/7) = 0
(2.5*x-7.5)/2.5+(-1*(28-14*x))/7 = 0
(7*(2.5*x-7.5))/(2.5*7)+(-1*2.5*(28-14*x))/(2.5*7) = 0
7*(2.5*x-7.5)-1*2.5*(28-14*x) = 0
52.5*x-122.5 = 0
(52.5*x-122.5)/(2.5*7) = 0
(52.5*x-122.5)/(2.5*7) = 0 // * 2.5*7
52.5*x-122.5 = 0
52.5*x-122.5 = 0 // + 122.5
52.5*x = 122.5 // : 52.5
x = 122.5/52.5
x = 2.33333333
x = 2.33333333
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