Selesaikan dan periksa 3x + 2 (x + 2) = 20 – (2x – 5)
Diketahui 3x+2(x+2)=20-(2x-5)
3x + 2(x) + 2(2) = 20 – 2x -(-5)
3x + 2x + 4 = 20 – 2x + 5
3x + 2x + 2x = 20 – 4 + 5
7x = 21
x = 21/7
x=3..
Memeriksa:
3x + 2 (x+2)=20-(2x-5)
substitusi x = 3
3(3) + 2(3+2) = 20 – (2(3) – 5)
9 + 2(5) = 20 -(6-5)
9 + 10 = 20 -(1)
19 = 19..
Jadi x = 3
10