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(5*x)/3 = (5/7)*(72-((5*x)/3)) // - (5/7)*(72-((5*x)/3))
(5*x)/3-((5/7)*(72-((5*x)/3))) = 0
(-5/7)*((-5/3)*x+72)+(5*x)/3 = 0
(5*x)/3-5/7*(72-5/3*x) = 0
(-5/7*3*(72-5/3*x))/3+(5*x)/3 = 0
5*x-5/7*3*(72-5/3*x) = 0
60/7*x-1080/7 = 0
(60/7*x-1080/7)/3 = 0
(60/7*x-1080/7)/3 = 0 // * 3
60/7*x-1080/7 = 0
60/7*x-1080/7 = 0 // + 1080/7
60/7*x = 1080/7 // : 60/7
x = 1080/7/60/7
x = 18
x = 18
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