Penyelesaian dari 5x
– 1 = 2x + 11 adalah. . . .
a. x
= 6
b. x
= 5
c. x
= 4
d. x
= 3
Penyelesaian
5x – 1 = 2x
+ 11
5x – 1 = 2x + 11
5x - 1
+ 1 = 2x + 11 + 1
5x = 2x
+ 12
5x – 2x = 12
3x = 12
x
= 12 : 3
x
= 4