Explicación paso a paso:
*3x = 30
x = 30/3 ---> x = 10
* 2x + x = 27 ---> 3x = 27
x= 27/3 ----> x=9
* x - 5 = 1
x = 5+1 ---> x=6
* y +3 = 15
y= 15 -3 ---> y=12
* 5x = 25
x= 25 /5 ---> x=5
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Explicación paso a paso:
*3x = 30
x = 30/3 ---> x = 10
* 2x + x = 27 ---> 3x = 27
x= 27/3 ----> x=9
* x - 5 = 1
x = 5+1 ---> x=6
* y +3 = 15
y= 15 -3 ---> y=12
* 5x = 25
x= 25 /5 ---> x=5