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3x + 6 =14
3x=14-6
3x=8 /:3
x=2,7
b .
3x + 2 = 20
3x=20-2
3x=18 /:3
x=6
c .
3 ( x +2 )= 5
3x+6=5
3x=5-6
3x=-1 /3
x=0,3
d .
3x +2 =7
3x=7-2
3x=5 /:3
x=1,7
e. 15 (x-15 )+6 * (2x + 3 )+10 =2x +7 -15
15x-225+12x+18+10=2x+7-15
15x+12x-2x=7-15+225-28
25x=189
x=7,56
3x+6=14
3x=14-6
3x=8 |:3
x=osiem trzecich
b)
3x+2=20
3x=20-2
3x=18 |:3
x=6
c)
3(x+2)=5
3x+6=5
3x=5-6
3x=-1 |:3
x= minus jedna trzecia
d)
3x+2-7=0
3x+2=7
3x=7-2
3x=5 |:3
x=pięć trzecich
e)
15 (x-15 )+6 * (2x + 3 )+10 =2x +7 -15
15x-225+12x+18+10=2x+7-15
27x-197=2x-8
27x-2x=-8+197
25x=189 |:25
x=7,56