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y-3=5-y segunda ecuacion x=-3
y+y=5+3
2y=8
y=4
2x+7=y-3
2x+7=4-3
2x=1-7
2x=-6
x=-3
2) A=B
2a-8=4
2a=4+8
a=12/2
a=6
a+b=15
6+b=15
b=9
calcular b-a
b=9
a=6
b-a=9-6=3