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-5 = 3x
-5/3 =x
b) 112x+312x =-2a -a
424x= -3a
x= -3a/424
c) -7x(5)-20=18
-35x=20+18
x=-38/ 35
d) -1/x= (-3/4) -4
-1/x =-19/4
-x=-4/19
x= 4/19