Answer:
3x – 3y + 5z = 13
x = 13/3 + y - 5z/3
y = - 13/3 + x + 5z/3
z = 13/5 - 3x/5 + 3y/5
5x + 6y – 2z = 10
x = 2 - 6y/5 + 2z/5
y = 5/3 - 5x/6 + z/3
z = -5 + 5x/2 + 3y
7x + 5y = 18
x = 18/7 - 5y/7
y = 18/5 - 7x/5
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