7(3x)+4x=78

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Solution for 7(3x)+4x=78 equation: 


Simplifying
7(3x) + 4x = 78

Remove parenthesis around (3x)
7 * 3x + 4x = 78

Multiply 7 * 3
21x + 4x = 78

Combine like terms: 21x + 4x = 25x
25x = 78

Solving
25x = 78

Solving for variable 'x'.

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

Divide each side by '25'.
x = 3.12

Simplifying
x = 3.12

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