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x * 3 + 50 + 100 = 750
3x + 150 = 750
3x = 750 - 150
3x = 600
x = 600 : 3 respuesta el numero es 200
x = 200
verificacion :
x * 3 +10 * 5 + 10 * 10 = 750
200 * 3 + 10 * 5 + 10 *10=750
600 + 50 + 100 = 750