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6*(12+x)=42*2
12+x=84/6
x=14-12
x=2
b) (x+2+x+2x-4)*4=44
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2
(4x-2)*2=44
8x-4=44
8x=44+4
8x=48
x=48/8
x=6
c) x= 7 i jedna trzecia
14*6/2=84/2 84/2=42
b) x=6
P=(a+b)*h/2 P=(6+16)*4/2 P=22*2 P=44
c) x=7⅓