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4x+12=35+5
4x=40-12
4x=28 /:4
x=7
b)9*(x+1)+25=37
9x+9=37-25
9x=12-9
9x=3 /:9
x=1/3
c)3*(x-2)-7=23
3x-6 =23+7
3x=30+6
3x=36 /:3
x=12
d)(8*x-4)*2=90
16x-8=90
16x=90+8
16x=98 / :16
x= 6,125
e)(x+9):5+12=16
x/5 +9/5 = 16-12
x/5 =4 - 9/5
x/5 = 20/5 -9/5
x/5= 11/5 / *5
x=11