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(2x - 1) + 11(2x - 1)=
=(1+11)(2x-1)=
=12(2x-1)
b)
-6(1/2x + y) - (-20) (1/2x + y)=
=[-6-(-20)](1/2x+y)=
=(-6+20)(1/2x+y)=
=14(1/2x+y)
c)
-3/4x (y +5) - (y +5)=
=(-3/4x-1)(y+5)