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= 50x-30+9x-15
= -30 + 59x -15
b.{(10x-3)+(5-3x)} (2x+1)
= {7x+2} (2x+1)
= 14+7x+4x+2
=14 +11x +2
c. (10x-3)+{(5-3x)(2x+1)}
=(10x-3)+{10x+5-6-3x}
=10x-3-6+7x+5
-6 +17x+2