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

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


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

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

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

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

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

Solving
63 = 70 + -7y

Solving for variable 'y'.

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

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

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

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

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

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

Divide each side by '7'.
y = 1

Simplifying
y = 1

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