SOLUTION: the sum of 21 and twice a number is -19. find the number ?
Algebra.Com
Question 944633: the sum of 21 and twice a number is -19. find the number ?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
Let X be a number
2X+21=-19 Subtract 21 from each side
2x=-40 Divide each side by 2
x=-20: ANSWER The number is -20
CHECK
The sum of 21 and twice -20 is -19
21+2(-20)=-19
21+(-40)=-19
-19=-19
RELATED QUESTIONS
the sum of the number is 25 and twice a number is... (answered by josgarithmetic)
The sum of twice a number and 3 less than the number is the same as the difference... (answered by josgarithmetic,ikleyn,greenestamps)
THE SUM OF TWICE A NUMBER AND 7 LESS THAN THE NUMBER IS THE SAME DIFFERENCE BETWEEN -19... (answered by solver91311)
three times the sum of a number and 4 is 21. find the... (answered by firebird72)
The sum of a number and 21 times it's reciprocal is -10. Find the... (answered by mananth,josmiceli,richwmiller)
The sum of twice a number and thrice the number is 100. find the number (answered by rfer)
The sum of a number and 17 is equal to twice the number. Find the... (answered by tommyt3rd)
The square of a number is equal to the sum of 21 and 4 times the number. Find the... (answered by Fombitz)
The sum of twice a first number and five times a second number is 111. If the second... (answered by mananth)