[(80x - 2011)/5 + 84/4] * 7 = 175
[(80x - 2011)/5 + 84/4] * 7 = 175
[(80x - 2011)/5 + 21] * 7 = 175
[(80x - 2011)/5 + 21] * 7 = 175
[(80x - 2011)/5 + (5 * 21)/5] * 7 = 1
[(80x - 2011 + 5 * 21)/5] * 7 = 175
[(80x - 2011 + 105)/5] * 7 = 175
[(80x - 2011 + 105)/5] * 7 = 175
[(80x - 1906)/5] * 7 = 175
7 * (80x - 1906)/5 = 175
7 * (80x - 1906)/5 = 175 (7(80x - 1906))/5 = 175
(7(80x - 1906))/5 = 175
(560x - 13342)/5 = 175
(560x - 13342)/5 = 175 5 * (560x - 13342)/5 = 5 * 175
5 * (560x - 13342)/5 = 5 * 175
560x - 13342 = 5 * 175
560x - 13342 = 5 * 175
560x - 13342 = 875
560x - 13342 = 875
560x - 13342 + 13342 = 875 + 13342
560x = 14217
(560x)/560 = 14217/560
x = 2031/80
Cu plăcere l-am făcut doar pe primul că e mult de scris
