-21=-7-7(3x+31)

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Solution for -21=-7-7(3x+31) equation:


Simplifying
-21 = -7 + -7(3x + 31)

Reorder the terms:
-21 = -7 + -7(31 + 3x)
-21 = -7 + (31 * -7 + 3x * -7)
-21 = -7 + (-217 + -21x)

Combine like terms: -7 + -217 = -224
-21 = -224 + -21x

Solving
-21 = -224 + -21x

Solving for variable 'x'.

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

Add '21x' to each side of the equation.
-21 + 21x = -224 + -21x + 21x

Combine like terms: -21x + 21x = 0
-21 + 21x = -224 + 0
-21 + 21x = -224

Add '21' to each side of the equation.
-21 + 21 + 21x = -224 + 21

Combine like terms: -21 + 21 = 0
0 + 21x = -224 + 21
21x = -224 + 21

Combine like terms: -224 + 21 = -203
21x = -203

Divide each side by '21'.
x = -9.666666667

Simplifying
x = -9.666666667

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