7+x+3x=-21

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Solution for 7+x+3x=-21 equation: 


Simplifying
7 + x + 3x = -21

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

Solving
7 + 4x = -21

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + 4x = -21 + -7

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

Combine like terms: -21 + -7 = -28
4x = -28

Divide each side by '4'.
x = -7

Simplifying
x = -7

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