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45 = 5x + 30
45 - 30 = 5x
15 = 5x
15/5 = x
3 = x
3x + 15 = 30
3x = 30 - 15
3x = 15
x = 15/3
x = 5
45 - 30 = 5x
15=5x
15/5 = x
3 = x
2) 3x + 15 = 30
3x = 30 - 15
3x = 15
x = 15/3
x= 5
Espero que te sirva :D