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6x-20=8+2
6x-20=10
6x=10+20
6x=30
X=5
9y-5=5y+19
9y-5y=19+5
4y=24
y=6
13-5y=7y+49
-5y-7y=49-13
-12y=36
y=-3
Puse la foto porque no me deja poner la respuesta
2x+4 -2x-28
2x+2x=-28-4
4x = -32
X=-8