Question

(5n^2+7n^3)+(7n^3-9n^2)

Answer 1

Jst an example Simplifying
8 + 3(-9n + -3) = -7(5n + -2) + -2

Reorder the terms:
8 + 3(-3 + -9n) = -7(5n + -2) + -2
8 + (-3 * 3 + -9n * 3) = -7(5n + -2) + -2
8 + (-9 + -27n) = -7(5n + -2) + -2

Combine like terms: 8 + -9 = -1
-1 + -27n = -7(5n + -2) + -2

Reorder the terms:
-1 + -27n = -7(-2 + 5n) + -2
-1 + -27n = (-2 * -7 + 5n * -7) + -2
-1 + -27n = (14 + -35n) + -2

Reorder the terms:
-1 + -27n = 14 + -2 + -35n

Combine like terms: 14 + -2 = 12
-1 + -27n = 12 + -35n

Solving
-1 + -27n = 12 + -35n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '35n' to each side of the equation.
-1 + -27n + 35n = 12 + -35n + 35n

Combine like terms: -27n + 35n = 8n
-1 + 8n = 12 + -35n + 35n

Combine like terms: -35n + 35n = 0
-1 + 8n = 12 + 0
-1 + 8n = 12

Add '1' to each side of the equation.
-1 + 1 + 8n = 12 + 1

Combine like terms: -1 + 1 = 0
0 + 8n = 12 + 1
8n = 12 + 1

Combine like terms: 12 + 1 = 13
8n = 13

Divide each side by '8'.
n = 1.625

Simplifying
n = 1.625

Answer 2

thanks

Answer 3

Welcome