1) 2(x - 5) = 6x - (x - 8)
On the left side of the equal sign, multiply everything in the parenthesis by 2.
On the right side of the equal sign, multiply everything in the parenthesis by -1.
2x - 10 = 6x - x + 8
Combine like terms.
2x - 10 = 5x + 8
Add 10 to both sides.
2x = 5x + 18
Subtract 5x from both sides.
-3x = 18
Divide -3 on both sides.
x = -6
2) 8x - 2y = 4z
Subtract 8x from both sides.
-2y = 4z - 8x
Divide -2 on both sides.
y = 4z - 8x / -2
Hope this helps!