(8x+3)+(x+3)=51

Solution for (8x+3)+(x+3)=51 equation:

Simplifying
(8x + 3) + (x + 3) = 51

Reorder the terms:
(3 + 8x) + (x + 3) = 51

Remove parenthesis around (3 + 8x)
3 + 8x + (x + 3) = 51

Reorder the terms:
3 + 8x + (3 + x) = 51

Remove parenthesis around (3 + x)
3 + 8x + 3 + x = 51

Reorder the terms:
3 + 3 + 8x + x = 51

Combine like terms: 3 + 3 = 6
6 + 8x + x = 51

Combine like terms: 8x + x = 9x
6 + 9x = 51

Solving
6 + 9x = 51

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 9x = 51 + -6

Combine like terms: 6 + -6 = 0
0 + 9x = 51 + -6
9x = 51 + -6

Combine like terms: 51 + -6 = 45
9x = 45

Divide each side by '9'.
x = 5

Simplifying
x = 5