Question

If A=5x+11y-15z,B=12x-13y+19z,C=7x-6y+21z,then find:
A-B+C​

Answer 1

Answer:

$5x + 11y - 15z - (12x - 13y + 19z) + 7x - 6y + 21z$

Step-by-step explanation:

Next step

change the sign

$5x + 11y - 15z - 12x + 13y - 19z + 7x - 6y + 21z$

Next step

Arrange the equation

$(5x - 12x + 7x) (11y + 13y - 6y) ( - 15z - 19z + 21z)$

Now answer

$18y - 13z$

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Answer 2

Answer:

A-B+C= 18y -13z

Step-by-step explanation:

A = 5x+11y-15z,

B =12x-13y+19z,

C =7x-6y+21z

A-B+C= (5x+11y-15z) - (12x-13y+19z) + (7x-6y+21z)

= 5x+11y-15z- 12x+ 13y-19z + 7x-6y+21z

= 5x-12x+7x+11y+13y-6y-15z-19z+21z

= 0x+18y-13z

A - B + C = 18y -13z