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3x=36
x=12
Ahi esta la repsuesta.
2x + 12 = 36
2x = 36 - 12
2x = 24
x = 24/2
x = 12
5x + 30 = 4x + 42
5x - 4x = 42 - 30
x = 12
x/2 - 4 = 2
x/2 = 2 + 4
x/2 = 6
x = 6 * 2
x = 12