4x+15+3x+6=

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Solution for 4x+15+3x+6= equation:


Simplifying
4x + 15 + 3x + 6 = 0

Reorder the terms:
15 + 6 + 4x + 3x = 0

Combine like terms: 15 + 6 = 21
21 + 4x + 3x = 0

Combine like terms: 4x + 3x = 7x
21 + 7x = 0

Solving
21 + 7x = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 7x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7x = 0 + -21
7x = 0 + -21

Combine like terms: 0 + -21 = -21
7x = -21

Divide each side by '7'.
x = -3

Simplifying
x = -3

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