This is the transitive property :)
Here's how one would solve it:
17 + 3x2 = 6x
17 + 6 = 6x
23 = 6x
x = 23/6
There's only one solution.
28x - 2 = 26x + 6
2x = 8
x = 4
K-263.48=381.09
we add 263.48 on both sides
k=644.57
Idk exactly what your question is asking, but I think you are doing genetics? If you are then you are talking about a punnet square. All four boxes should be heterozygous(Cc). Hope this helps.