3(x+15)+21=3(5x+10)-3x

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Solution for 3(x+15)+21=3(5x+10)-3x equation:


Simplifying
3(x + 15) + 21 = 3(5x + 10) + -3x

Reorder the terms:
3(15 + x) + 21 = 3(5x + 10) + -3x
(15 * 3 + x * 3) + 21 = 3(5x + 10) + -3x
(45 + 3x) + 21 = 3(5x + 10) + -3x

Reorder the terms:
45 + 21 + 3x = 3(5x + 10) + -3x

Combine like terms: 45 + 21 = 66
66 + 3x = 3(5x + 10) + -3x

Reorder the terms:
66 + 3x = 3(10 + 5x) + -3x
66 + 3x = (10 * 3 + 5x * 3) + -3x
66 + 3x = (30 + 15x) + -3x

Combine like terms: 15x + -3x = 12x
66 + 3x = 30 + 12x

Solving
66 + 3x = 30 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
66 + 3x + -12x = 30 + 12x + -12x

Combine like terms: 3x + -12x = -9x
66 + -9x = 30 + 12x + -12x

Combine like terms: 12x + -12x = 0
66 + -9x = 30 + 0
66 + -9x = 30

Add '-66' to each side of the equation.
66 + -66 + -9x = 30 + -66

Combine like terms: 66 + -66 = 0
0 + -9x = 30 + -66
-9x = 30 + -66

Combine like terms: 30 + -66 = -36
-9x = -36

Divide each side by '-9'.
x = 4

Simplifying
x = 4

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