102=7(2x+6)+6x

解答

102 = 7 (2 x + 6) + 6 x

x = 3

求解步骤

102 = 7 (2 x + 6) + 6 x

交换两边

7 (2 x + 6) + 6 x = 102

展开

7 (2 x + 6) + 6 x : 20 x + 42

20 x + 42 = 102

将

42

到右边

20 x = 60

两边除以

20

x = 3

6 (x + 7) = 9 (5 - 6 x) - 3

so l v e f or x, y = - f (x - 2)

so l v e f or x, x - 9 y = - 29

so l v e f or x, 2 x - 10 y = - 20

so l v e f or x, 12 x - 20 y = 60