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(1/7)*(a+4) = (1/4)*(5-a) // - (1/4)*(5-a)
(1/7)*(a+4)-((1/4)*(5-a)) = 0
(1/7)*(a+4)+(-1/4)*(5-a) = 0
1/7*(a+4)-1/4*(5-a) = 0
1/7*(a+4)-1/4*(5-a) = 0
11/28*a-19/28 = 0
11/28*a-19/28 = 0
11/28*a-19/28 = 0 // + 19/28
11/28*a = 19/28 // : 11/28
a = 19/28/11/28
a = 19/11
a = 19/11
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