7*9=(7*10)-(7*n)

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Solution for 7*9=(7*10)-(7*n) equation:


Simplifying
7 * 9 = (7 * 10) + -1(7n)

Multiply 7 * 9
63 = (7 * 10) + -1(7n)

Multiply 7 * 10
63 = (70) + -1(7n)
63 = 70 + -1(7n)

Remove parenthesis around (7n)
63 = 70 + -1 * 7n

Multiply -1 * 7
63 = 70 + -7n

Solving
63 = 70 + -7n

Solving for variable 'n'.

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

Add '7n' to each side of the equation.
63 + 7n = 70 + -7n + 7n

Combine like terms: -7n + 7n = 0
63 + 7n = 70 + 0
63 + 7n = 70

Add '-63' to each side of the equation.
63 + -63 + 7n = 70 + -63

Combine like terms: 63 + -63 = 0
0 + 7n = 70 + -63
7n = 70 + -63

Combine like terms: 70 + -63 = 7
7n = 7

Divide each side by '7'.
n = 1

Simplifying
n = 1

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