(a-10)+(a/10)=200 a=

a - 10 + a/10 = 200
a + a/10 = 210
a(1 + 1/10) = 210
a(10/10 + 1/10) = 210
a(11/10) = 210
a = 210 × 10/11
a = 2100/11

Bab Persamaan Linear
Matematika SMP Kelas VII

(a - 10) + (a / 10) = 200
***semua dikalikan 10***
10a - 100 + a = 2.000
11a = 2.000 + 100
a = 2.100/11
a = 190 10/11