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3 (4x - 5) + 8 = 12
12x - 15 + 8 = 12
12x = 12 - 8 + 15
12x = 19
x = 19/12
Respuesta :
x = 19/12
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2)
8y + 45 + 9 = -2y + 4
8y + 2y = 4 - 9 - 45
10y = -50
y = -50/10
y = -5
Respuesta :
y = -5
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3)
25m + 5m = 20 + 10 + 70
50m = 100
m = 100/50
m = 2
Respuesta :
m = 2