Rozwiąż równanie.
a) 7-2x=7x-2
b) 2/3(6x-9)=12
c) 1/10(25x-40)+2=3/4(8x+12)-9
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a)7-2x=7x-2
-2x-7x=-2-7
-9x=-9 /:-9
x=1
b)⅔(6x-9)=12
4x-6=12
4x=12+6
4x=18
x=18:4=4,5
c)0,1(25x-40)+2=¾(8x+12)-9
2,5x-4+2=6x+9-9
2,5x-2=6x
2,5x-6x=2
-3,5x=2
x=2 : (-⁷/₂)=2·(-²/₇)= -⁴/₇
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a)7-2x=7x-2
-2x-7x=-2-7
-9x=-9 /:-9
x=1
b)⅔(6x-9)=12
4x-6=12
4x=12+6
4x=18
x=18:4=4,5
c)0,1(25x-40)+2=¾(8x+12)-9
2,5x-4+2=6x+9-9
2,5x-2=6x
2,5x-6x=2
-3,5x=2
x=2 : (-⁷/₂)=2·(-²/₇)= -⁴/₇