Respostas

2014-08-21T14:24:33-03:00
A) 7.(x+4)-16=0  => 7x+28-16=0  => 7x=12 => x=12/7
b) 5.(4b-3)-37b=0  => 20b-15-37b=0 => -17b=15 => b=15/-17
c) (54w+18)+2.(5-7w)=0  => 54w+18+10-14w=0 => 40w+28=0 => 40w=-28 => w=-28/40 => simplificando por 4: w=-7/10
d) (8+6t).5-(27t-3)+4=0  => 40+30t-27t-3+4=0 => 44+3t => 3t=-44 => t=-44/3
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