Question

Quanto é 2c-c+7c=-2c+100?

Answer 1

2c - c + 7c = -2c + 100
2c - c + 7c + 2c = 100
2c + 7c + 2c - c = 100
11c - c = 100
10c = 100
c = 100/10
c = 10

Answer 2

2c - c + 7c = - 2c + 100
2c + 2c - c + 7c = 100
4c - c + 7c = 100
3c + 7c = 100
10c = 100
c = 100 / 10
c = 10