8z-5 = 11
add 5 to both sides
8z = 16
divide both sides by 8
z = 2
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10x + 2y + 8z - 5x + 4z - 4y = 10x - 5x + 2y - 4y + 8z + 4z = (10 - 5)x + (2 - 4)y + (8 + 4)z = 5x - 2y + 12z
By collecting like terms: 8z+4-2x
5 times y is the same as 5y in algebra
That's an equation where x = 5
Algebra is using variables such as x to solve a problem. One example is x+3=8 in which x equals 5.