213.15=(x+7.30+2.40)21

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Solution for 213.15=(x+7.30+2.40)21 equation: 


Simplifying
213.15 = (x + 7.30 + 2.40) * 21

Reorder the terms:
213.15 = (7.30 + 2.40 + x) * 21

Combine like terms: 7.30 + 2.40 = 9.7
213.15 = (9.7 + x) * 21

Reorder the terms for easier multiplication:
213.15 = 21(9.7 + x)
213.15 = (9.7 * 21 + x * 21)
213.15 = (203.7 + 21x)

Solving
213.15 = 203.7 + 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.
213.15 + -21x = 203.7 + 21x + -21x

Combine like terms: 21x + -21x = 0
213.15 + -21x = 203.7 + 0
213.15 + -21x = 203.7

Add '-213.15' to each side of the equation.
213.15 + -213.15 + -21x = 203.7 + -213.15

Combine like terms: 213.15 + -213.15 = 0.00
0.00 + -21x = 203.7 + -213.15
-21x = 203.7 + -213.15

Combine like terms: 203.7 + -213.15 = -9.45
-21x = -9.45

Divide each side by '-21'.
x = 0.45

Simplifying
x = 0.45

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