l.1.
a)x=7+5=12
b)-2x=22
x=-11
2.a)x€{1,9}
b)x€{-5}
3.a)x€{19,20,21,22,23,...}
b)x€{-7,-8,-9,-10,-11...}
4.a)12
b)4
ll.1.a)4(x-2)-3(x+6)=2(x-4)
4x-8-3x-18=2x-8
x-26=2x-8
-x=18
x=-18
b)5-2(x-1)>3(2-x)-5
5-2x+2>6-3x-5
7-2x>1-3x
x>-6
x€{-5,-4,-3,-2,-1,0,1,2,3,...}
3.(m-2)=(f-2)×7
m-2=7f-14
m=7f-12
m+f=36
m=36-f
36-f=7f-12
8f=48
f=6
4.
a+b=306
a:b=3 rest 22
a=3b+22
3b+22+b=306
4b=284
b=71
a=306-71=235
