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3x -5 (-1-4x) = 5
3x +6 +20x = 5
3x+20x = 5 - 6
23x = -1
x = -1/23
y = -1 -4 (-1/23) = -1 +4/23
y = -19/23
creo que sería así, no sé si estará bien... espero que te sirva!