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a) 2x+5 para x=4
2x+5=2(4) + 5=8+5=13
b) a+ab+b para a=5 b=1/3
a+ab+b= 5+5(1/3)+1/3=5+5/3+1/3
= 5 +6/3=5+2=7
c)(x-6)/2 para x=12
(12-6)/2=6/2=3