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Answer Key 3.7

  1. 2x+5=25
  2. 4x+12=36
  3. 3x−8=22
  4. 6x−8=22
  5. x−8=x2
  6. x−4=x2
  7. x+x+1+x+2=21
  8. x+x+2−(x+4)=5
  9. a
    5+3x=17−5−53x=12x=123or 4
  10. a
    3x−5=10+5+53x=15x=153or 5
  11. a
    60+9x=10x−2+2−9x−9x+262=x
  12. a
    7x−11=6x+5−6x+11−6x+11x=16
  13. a
    x+x+1+x+2=1083x+3=108−3−33x=105x=1053 or 35∴35,36,37
  14. a
    x+x+1+x+2=−1263x+3=−126−3−0033x=−129x=−1293 or −43∴−43,−42,−41
  15. a
    x+2(x+1)+3(x+2)=−76x+2x+2+3x+6=−766x+8=−76−8−086x=−84x=−846 or −14∴−14,−13,−12
  16. a
    x+2(x+2)+3(x+4)=070x+2x+4+3x+12=0706x+16=070−16−166x=54x=546 or 9∴9,11,13

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