420=21(5+3x)

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Solution for 420=21(5+3x) equation:


Simplifying
420 = 21(5 + 3x)
420 = (5 * 21 + 3x * 21)
420 = (105 + 63x)

Solving
420 = 105 + 63x

Solving for variable 'x'.

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

Add '-63x' to each side of the equation.
420 + -63x = 105 + 63x + -63x

Combine like terms: 63x + -63x = 0
420 + -63x = 105 + 0
420 + -63x = 105

Add '-420' to each side of the equation.
420 + -420 + -63x = 105 + -420

Combine like terms: 420 + -420 = 0
0 + -63x = 105 + -420
-63x = 105 + -420

Combine like terms: 105 + -420 = -315
-63x = -315

Divide each side by '-63'.
x = 5

Simplifying
x = 5

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