(x + 7) / 8 = 9x + 7 = 9 * 8x + 7 = 72x = 72 - 7x = 65
9 * (x + 6) = 729x + 54 = 729x = 72 - 549x = 18x = 18 / 9x = 2
6x + 11x + 15 = 32117x + 15 = 32117x = 321 - 1517x = 306x = 306 / 17x = 18
(x + 7) / 8 = 9
x + 7 = 9 * 8
x + 7 = 72
x = 72 - 7
x = 65
9 * (x + 6) = 72
9x + 54 = 72
9x = 72 - 54
9x = 18
x = 18 / 9
x = 2
6x + 11x + 15 = 321
17x + 15 = 321
17x = 321 - 15
17x = 306
x = 306 / 17
x = 18