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2+3+x=9
5+x=9
x=9-5
x=4
B) y - (3 - y) = 5
y-3+y=5
2y-3=5
2y=5+3
2y=8 |:2
y=4
C) 2 + (z + 3) = 4 - (z + 4)
2+z+3=4-z-4
5+z=-z
z+z=-5
2z= -5 |:2
z= -2,5
D) 2 ( x + 3) = x
2x+6=x
2x-x=-6
x=-6
E) -5 ( y - 3) = 7y
-5y+15=7y
-5y-7y=-15
-12y=-15 |:(-12)
y=¹⁵/₁₂
y=1³/₁₂
y=1¼
F) 4 (x - 1) = 2 (x - 5) + 6
4x-4=2x-10+6
4x-2x=-4+4
2x=0 |:2
x=0