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

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


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

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

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

Combine like terms: 70 + -7 = 63
63 = 63 + 1x

Add '-63' to each side of the equation.
63 + -63 = 63 + -63 + 1x

Combine like terms: 63 + -63 = 0
0 = 63 + -63 + 1x

Combine like terms: 63 + -63 = 0
0 = 0 + 1x
0 = 1x

Solving
0 = 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
0 + -1x = 1x + -1x
Remove the zero:
-1x = 1x + -1x

Combine like terms: 1x + -1x = 0
-1x = 0

Divide each side by '-1'.
x = 0

Simplifying
x = 0

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