10(n-1)+10(n-2)=30

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Solution for 10(n-1)+10(n-2)=30 equation:


Simplifying
10(n + -1) + 10(n + -2) = 30

Reorder the terms:
10(-1 + n) + 10(n + -2) = 30
(-1 * 10 + n * 10) + 10(n + -2) = 30
(-10 + 10n) + 10(n + -2) = 30

Reorder the terms:
-10 + 10n + 10(-2 + n) = 30
-10 + 10n + (-2 * 10 + n * 10) = 30
-10 + 10n + (-20 + 10n) = 30

Reorder the terms:
-10 + -20 + 10n + 10n = 30

Combine like terms: -10 + -20 = -30
-30 + 10n + 10n = 30

Combine like terms: 10n + 10n = 20n
-30 + 20n = 30

Solving
-30 + 20n = 30

Solving for variable 'n'.

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

Add '30' to each side of the equation.
-30 + 30 + 20n = 30 + 30

Combine like terms: -30 + 30 = 0
0 + 20n = 30 + 30
20n = 30 + 30

Combine like terms: 30 + 30 = 60
20n = 60

Divide each side by '20'.
n = 3

Simplifying
n = 3

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