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8x+13=133
8x=133-13
8x=120
x=120/8
x=15
el ancho mide 15 m
ancho: xm
calcular ancho: ¿?
133m = 8xm + 13m
133m - 13m = 8xm
120m = 8xm
120m/8m = x
15m = x