Question

sacar el valor  de a con literales (comprovacion)

20a-10+a=7a+2

Answer 1

20a - 10 +a = 7a +2
21a -10 = 7a +2
21a -7a = 2+10
14a = 12
a = 12/14
a = 6/7

comprobacion
20*6/7 -10 + 6/7 = 7*6/7 +2
120/7 - 10 +6/7 = 6+2
126/7 - 10 = 8
126/7 - 70/7 = 8
56/7 = 8
8  = 8