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15y+3y=4-9
18y=-5
y=-5\18
2)
2z+6z+36=42-25
8z=42-25-36
8z=-19
z=-19\8
3) (ecuación mal planteada)
3x+6x-15=7x+2x-13+4
3x+6x-7x-2x=-13+4+15
0=6