What is (7x-y)-(7x+9y) ?

The solution to (7x-y)-(7x+9y) is -10y

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simplify (7x-y)-(7x+9y)

simplify

(7 x - y) - (7 x + 9 y)

- 10 y

Solution steps

(7 x - y) - (7 x + 9 y)

Apply rule:

(a) = a

(7 x - y) = 7 x - y

= 7 x - y - (7 x + 9 y)

Apply the distributive law:

- (a + b) = - a - b

- (7 x + 9 y) = - 7 x - 9 y

= 7 x - y - 7 x - 9 y

Group like terms

= 7 x - 7 x - y - 9 y

Add similar elements:

7 x - 7 x = 0

= - y - 9 y

Add similar elements:

- y - 9 y = - 10 y

= - 10 y

(\frac{a ^{2} b}{a b ^{3}})^{2}

(5 x - 6) (x + 2)

- \frac{1}{2} 3

19 x - 3 (5 x - 2)

2 (\frac{7}{2})