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x+3(x-1)= 33
x+3x-3=33
4x=33+3
4x=36
x=36/4
x=9
Bueno espero ayudarte ;)
El triple = 3x
Resolvemos :
x + 3 (x - 1) = 33
x + 3x - 3 = 33
4x - 3 = 33
4x = 33 + 3
4x = 36
x = 36/4
x = 9
Solución : El número es 9