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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
(-5/21)*(72-5*x)+(5*x)/3 = 0
(5*x)/3-5/21*(72-5*x) = 0
(-5/21*3*(72-5*x))/3+(5*x)/3 = 0
5*x-5/21*3*(72-5*x) = 0
60/7*x-360/7 = 0
(60/7*x-360/7)/3 = 0
(60/7*x-360/7)/3 = 0 // * 3
60/7*x-360/7 = 0
60/7*x-360/7 = 0 // + 360/7
60/7*x = 360/7 // : 60/7
x = 360/7/60/7
x = 6
x = 6
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