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4x-3x=5-1
x=4
b) x-3-5=2(x-8)
x-3-5=2x-16
x-2x=-16+3+5
-x=-8/;-1
x=8
c) 7x-1=⅓ (x+7)
7x-1=⅓x+2⅓
7x-⅓x=2⅓+1
6⅔x=3⅓ / ; 6⅔
x=2
niestety d nie wiem jak zrobić ;/