21+9=3.5+x

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Solution for 21+9=3.5+x equation:


Simplifying
21 + 9 = 3.5 + x

Combine like terms: 21 + 9 = 30
30 = 3.5 + x

Solving
30 = 3.5 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
30 + -1x = 3.5 + x + -1x

Combine like terms: x + -1x = 0
30 + -1x = 3.5 + 0
30 + -1x = 3.5

Add '-30' to each side of the equation.
30 + -30 + -1x = 3.5 + -30

Combine like terms: 30 + -30 = 0
0 + -1x = 3.5 + -30
-1x = 3.5 + -30

Combine like terms: 3.5 + -30 = -26.5
-1x = -26.5

Divide each side by '-1'.
x = 26.5

Simplifying
x = 26.5

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