5(7+x)=21

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Solution for 5(7+x)=21 equation: 


Simplifying
5(7 + x) = 21
(7 * 5 + x * 5) = 21
(35 + 5x) = 21

Solving
35 + 5x = 21

Solving for variable 'x'.

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

Add '-35' to each side of the equation.
35 + -35 + 5x = 21 + -35

Combine like terms: 35 + -35 = 0
0 + 5x = 21 + -35
5x = 21 + -35

Combine like terms: 21 + -35 = -14
5x = -14

Divide each side by '5'.
x = -2.8

Simplifying
x = -2.8

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