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(7*x-7)/4+(9*x+4)/8 = 16 // - 16
(7*x-7)/4+(9*x+4)/8-16 = 0
(8*(7*x-7))/(4*8)+(4*(9*x+4))/(4*8)+(-16*4*8)/(4*8) = 0
8*(7*x-7)+4*(9*x+4)-16*4*8 = 0
92*x-512-40 = 0
92*x-552 = 0
(92*x-552)/(4*8) = 0
(92*x-552)/(4*8) = 0 // * 4*8
92*x-552 = 0
92*x-552 = 0 // + 552
92*x = 552 // : 92
x = 552/92
x = 6
x = 6
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