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b)4*(2y-1)/4=2y-1
c)5*(-2a+3)/5 + 6*(2a-3)/6=-2a+3+2a-3=0
d) 7*(2x-3)/7 - 8*(8-2x)/8=2x-3 -8+2x=4x-11
b) 8y-4/4=4(2y-1/1)=8y-1
c)-10a+15/5+12a-18/6=5(-2a+3/1)+6(2a-3/1)+-10a+3+12a-3=2a
d)14x-21/7-64-16x/8=7(2x-3/1)-8(8-2x/1)=14x-3-64+2x=16x-67
8y-4/4=4(2y-1/1)=4(2y-1)
-10a+15/5+12-12a-18/6=-10a+3+12-12a-3=-22a+12=2(-11a+6)
14x-21/7-64-16x/8=14x-3-64-2x=12x-67