1) (43+y)-61=115 43+y-61=115 -18+y+115 y=115+18 y=1332) 718-(25+t)39718+(-25-t)39718-975-39t-257-39t3) (a-97)+325=444a-97+255=444a=444-255a=1894) 24(x-9)=1080x-9=45x=45+9x=545) (5+b)2=1000410+2b=100042b=10004-102b=99942=49976)(433-c):9=223433-c-------- = 223 9433-c=2007-c=2007-433c= -15747) 1836:(p-4)=9181836------- =918 p-41836------- =918, p≠4 p-41836=918(p-4)1836=918p-3672-918p=-3672-1836-918p=-5508p=6, p≠4p=68) 15y+43=157315y=1573-4315y=1530y=1029)63-5z=28-5z=28-63-5z=-35z=710) 91-81=1810≠18