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= 50x-30
= -30
b.{(10x-3)+(5-3x)} (2x+1)
= {7x+2} (2x+1)
= 14
=14
c. (10x-3)+{(5-3x)(2x+1)}
=(10x-3)+{10x+5-6
=10x-3-6
-6