4+3x=-21

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Solution for 4+3x=-21 equation: 


Simplifying
4 + 3x = -21

Solving
4 + 3x = -21

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + 3x = -21 + -4

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

Combine like terms: -21 + -4 = -25
3x = -25

Divide each side by '3'.
x = -8.333333333

Simplifying
x = -8.333333333

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