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9s+3t=0
9(9)+3t=0
81+3t=0
3T=-81
t=-27
cuando t = -6
9s+3t=0
9s+3(-6)=0
9s=18
s=18/9
s=2
=81+(-18)
=67
al sumar un numero negativo se multiplica el - por el + eso es igual a - osea se resta