3(21+x)=3(21)+3(15)

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Solution for 3(21+x)=3(21)+3(15) equation: 


Simplifying
3(21 + x) = 3(21) + 3(15)
(21 * 3 + x * 3) = 3(21) + 3(15)
(63 + 3x) = 3(21) + 3(15)

Multiply 3 * 21
63 + 3x = 63 + 3(15)

Multiply 3 * 15
63 + 3x = 63 + 45

Combine like terms: 63 + 45 = 108
63 + 3x = 108

Solving
63 + 3x = 108

Solving for variable 'x'.

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

Add '-63' to each side of the equation.
63 + -63 + 3x = 108 + -63

Combine like terms: 63 + -63 = 0
0 + 3x = 108 + -63
3x = 108 + -63

Combine like terms: 108 + -63 = 45
3x = 45

Divide each side by '3'.
x = 15

Simplifying
x = 15

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