x+(x-20)=78

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Solution for x+(x-20)=78 equation:


Simplifying
x + (x + -20) = 78

Reorder the terms:
x + (-20 + x) = 78

Remove parenthesis around (-20 + x)
x + -20 + x = 78

Reorder the terms:
-20 + x + x = 78

Combine like terms: x + x = 2x
-20 + 2x = 78

Solving
-20 + 2x = 78

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + 2x = 78 + 20

Combine like terms: -20 + 20 = 0
0 + 2x = 78 + 20
2x = 78 + 20

Combine like terms: 78 + 20 = 98
2x = 98

Divide each side by '2'.
x = 49

Simplifying
x = 49

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