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Despeje. x= 60-2y ÷ 3
6x-7y=21
Despe... x= 21-7y ÷ 6
60-2y÷3 = 21-7y ÷ 6
6(60-2y) = 3(21-7y)
360-12y = 63-21y
-12y+21y = -360+63
9y= -297
y= -297 ÷9
y= -33
6x-7y=21
6x-7(-33)=21
6x+231=21
6x = -231+21
6x= 252 ÷ 6
x = 42
comprobacion
3x+2y=60
3(42) + 2(-33)
126 - 66
60=60