QuestionCombine the expressions: $(2x + 5y - z) + (-6x - 4y + 7z) - 4x + 6y + 6z + 4x + y + 6z - 4x - y + 6z$.

Studdy Solution
We see that the first and second expressions are equal to the third, fifth and sixth expressions. Therefore, we can say that all the given expressions are equal.
$$-4x + y +z = -4 x+ y+ z = -4 x+y+ z = -4 x-y+ z$$