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7x-1=1/3(x+7)
7x-1=1/3x+7/3 (/----->oznacza kreskę ułamkową)
7x- 1/3x= 7/3 + 1
6 2/3 x= 7/3+3/3
20/3x= 10/3
x= 10/3 * 3/2o
x= 10/20
x=1/2
Spr:
L= 7x-1= 7*1/2-1= 7/2-1= 3,5-1=2,5
P=1/3(x+7)= 1/3(1/2+7)= 1/6+7/3= 1/6+14/6=15/6=2 3/6=2,5
L=P