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a) 3(4x+ 5)= 29
b) 2/3 x + 6= -8+ 1/3 x
c) 2(x+3)−9=x−4
d) 2(x−1)+x=x−3(2−3x)


Odpowiedź :

a) 3(4x+ 5)= 29

12x+15=29

12x=29-15

12x=14 |:12

x=14/12

x=1 ⅙

b) 2/3 x + 6= -8+ 1/3 x

⅔x-⅓x=-8-6

⅓x=-14 |*3

x=-42

c) 2(x+3)−9=x−4

2x+6-9=x-4

2x-x=-4+9-6

x=-1

d) 2(x−1)+x=x−3(2−3x)

2x-2+x=x-6+9x

2x-x+x-9x=-6+2

-7x=-4 |:(-7)

x=4/7