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(5*x-7)/a = 12 // - 12
(5*x-7)/a-12 = 0
(5*x-7)/a+(-12*a)/a = 0
5*x-12*a-7 = 0
(5*x-12*a-7)/a = 0
(5*x-12*a-7)/a = 0 // * a
5*x-12*a-7 = 0
5*x-12*a-7 = 0 // + -12*a-7
5*x = -(-12*a-7) // : 5
x = (-(-12*a-7))/5
x = (7-(-12*a))/5
x = (7-(-12*a))/5
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