3.5*(3.5+x)=73.5

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Solution for 3.5*(3.5+x)=73.5 equation: 


Simplifying
3.5(3.5 + x) = 73.5
(3.5 * 3.5 + x * 3.5) = 73.5
(12.25 + 3.5x) = 73.5

Solving
12.25 + 3.5x = 73.5

Solving for variable 'x'.

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

Add '-12.25' to each side of the equation.
12.25 + -12.25 + 3.5x = 73.5 + -12.25

Combine like terms: 12.25 + -12.25 = 0.00
0.00 + 3.5x = 73.5 + -12.25
3.5x = 73.5 + -12.25

Combine like terms: 73.5 + -12.25 = 61.25
3.5x = 61.25

Divide each side by '3.5'.
x = 17.5

Simplifying
x = 17.5

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