Ex1:
1/ Prect=2[(x+1)+5]=2x+12
2/ Pcarr=4x
Prect=Pcarr <=> 2x-12=0
3/x=6
Ex2:
1/ Prect=2[(2x-1)+(7-x)]=2x+12
2/ Pcarr=4(x+0.5)=4x+2
Pcarr=Prect <=> 2x-10=0
3/ x=5
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Ex1:
1/ Prect=2[(x+1)+5]=2x+12
2/ Pcarr=4x
Prect=Pcarr <=> 2x-12=0
3/x=6
Ex2:
1/ Prect=2[(2x-1)+(7-x)]=2x+12
2/ Pcarr=4(x+0.5)=4x+2
Pcarr=Prect <=> 2x-10=0
3/ x=5