98=m-(-78)

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Solution for 98=m-(-78) equation:


Simplifying
98 = m + -1(-78)

Multiply -1 * -78
98 = m + 78

Reorder the terms:
98 = 78 + m

Solving
98 = 78 + m

Solving for variable 'm'.

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

Add '-1m' to each side of the equation.
98 + -1m = 78 + m + -1m

Combine like terms: m + -1m = 0
98 + -1m = 78 + 0
98 + -1m = 78

Add '-98' to each side of the equation.
98 + -98 + -1m = 78 + -98

Combine like terms: 98 + -98 = 0
0 + -1m = 78 + -98
-1m = 78 + -98

Combine like terms: 78 + -98 = -20
-1m = -20

Divide each side by '-1'.
m = 20

Simplifying
m = 20

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