3(7-x)=30-x

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Solution for 3(7-x)=30-x equation:


Simplifying
3(7 + -1x) = 30 + -1x
(7 * 3 + -1x * 3) = 30 + -1x
(21 + -3x) = 30 + -1x

Solving
21 + -3x = 30 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
21 + -3x + x = 30 + -1x + x

Combine like terms: -3x + x = -2x
21 + -2x = 30 + -1x + x

Combine like terms: -1x + x = 0
21 + -2x = 30 + 0
21 + -2x = 30

Add '-21' to each side of the equation.
21 + -21 + -2x = 30 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 30 + -21
-2x = 30 + -21

Combine like terms: 30 + -21 = 9
-2x = 9

Divide each side by '-2'.
x = -4.5

Simplifying
x = -4.5

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