-4 < -2x + 4 <12
How do you solve this compound inequality

Write the equation in logarithmic form m^x=n

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Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?