2x+7=13 |-7 2x=6 |/2 x=2 b)7x+4=3x+20 4x+4=20 4x=16 x=4 c)9x+10=4x+25 5x+10=25 5x=15 x=3 d)2x-5=17 2x=22 x=11 e)4x-9=x+12 3x-9=12 3x=21 x=7 f)5x-12=3x+4 2x-12=4 2x=16 x=8 g)6x-18=2x+2 4x-18=2 4x=20 x=5
a)2x+7=13 /-7 2x =6 /:2 x=3 b)7x+4=3x+20 /-4 ; -3x 4x = 16 /:4 x=4 c)9x+10=4x+25 /-4x ; -10 5x=15 / :5 x= 3 d)2x-5=17 / +5 2x = 23 / :2 x= 11,5 e)4x-9=x+12 /+9 ; - x 3x = 21 / :3 x= 7 f)5x-12=3x+4 /+12 ; - 3x 2x = 16 / :2 x=8 g)6x-18=2x+2 / +18 ; - 2x 4x = 20 / :4 x= 20
a)2x+7=13 2x=13-7 2x=6/:2 x=3 b)7x+4=3x+20 7x-3x=20-4 4x=16/:4 x=4 c)9x+10=4x+25 9x-4x=25-10 5x=15/:5 x=3 d)2x-5=17 2x=17+5 2x=22/:2 x=11 e)4x-9=x+12 4x-x=12+9 3x=21/:3 x=7 f)5x-12=3x+4 5x-3x=4+12 2x=16/:2 x=8 g)6x-18=2x+2 6x-2x=2+18 4x=20/:4 x=5
