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3y/12=20 5y+2y = 57-15 5y = 55
3y = 20.12 7y = 42 y = 11
3y = 240 y = 42/7
y = 240/3 y= 6
y = 80
4.- 4y/5-7= 13 5.- 9y-12 = 24+3y
4y/-2 = 13 6y = 36
4y = 13 .(-2) y = 6
4y = -26
y = -26/4
y = -13/2