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- 4 (1) + y = 17
- 4 + y = 17
y = 17 + 4
y = 21
- 4x + (-7) = 17
- 4x - 7 = 17
- 4x = 17 + 7
- 4x =24
x = 24/-4
x = - 6
Solución :
x = - 6
y = 21