3+x-15=20-3x

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Solution for 3+x-15=20-3x equation:


Simplifying
3 + x + -15 = 20 + -3x

Reorder the terms:
3 + -15 + x = 20 + -3x

Combine like terms: 3 + -15 = -12
-12 + x = 20 + -3x

Solving
-12 + x = 20 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-12 + x + 3x = 20 + -3x + 3x

Combine like terms: x + 3x = 4x
-12 + 4x = 20 + -3x + 3x

Combine like terms: -3x + 3x = 0
-12 + 4x = 20 + 0
-12 + 4x = 20

Add '12' to each side of the equation.
-12 + 12 + 4x = 20 + 12

Combine like terms: -12 + 12 = 0
0 + 4x = 20 + 12
4x = 20 + 12

Combine like terms: 20 + 12 = 32
4x = 32

Divide each side by '4'.
x = 8

Simplifying
x = 8

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