a) x + 2x - x = 9
2x = 9 |:2
x = 4,5
b) y + 2y + y = 11 + 5
4y = 16 |:4
y = 4
c) 3a - a - a = -1 + 7 - 4
a = 2
d) -2b -b +b +b = 10 + 4 - 10 - 6
-1b = -2 |:(-1)
b = 2
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a) x + 2x - x = 9
2x = 9 |:2
x = 4,5
b) y + 2y + y = 11 + 5
4y = 16 |:4
y = 4
c) 3a - a - a = -1 + 7 - 4
a = 2
d) -2b -b +b +b = 10 + 4 - 10 - 6
-1b = -2 |:(-1)
b = 2
3x-x=9
2x=9 /:2
x=4,5
b) y+2y-5= 11-y
3y+y=11+5
4y=16 /:
y=4
c) 3a+4= a-1 + a+7
3a-2a=6-4
a=2
d) 10-2b+ 6-b = 10-b + 4-b
-3b+2b=-2
-a=-2 /:(-1)
a=2