Toán Lớp 7: Rút gọn biểu thức sau: (3x+y-z)

(3x+y-z) - (4x-2y+6z) = (3x-4x) + (y+2y) +(-z-6z) = -x +3y - 7z

( 3x + y - z ) - ( 4x - 2y + 6z ) = 3x + y - z - 4x + 2y - 6z = ( 3x - 4x ) + ( y + 2y ) - ( z + 6z ) = -x + 3y - 7z

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Toán Lớp 7: Rút gọn biểu thức sau: (3x+y-z) – (4x-2y+6z)