3(400+x)=36

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Solution for 3(400+x)=36 equation: 


Simplifying
3(400 + x) = 36
(400 * 3 + x * 3) = 36
(1200 + 3x) = 36

Solving
1200 + 3x = 36

Solving for variable 'x'.

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

Add '-1200' to each side of the equation.
1200 + -1200 + 3x = 36 + -1200

Combine like terms: 1200 + -1200 = 0
0 + 3x = 36 + -1200
3x = 36 + -1200

Combine like terms: 36 + -1200 = -1164
3x = -1164

Divide each side by '3'.
x = -388

Simplifying
x = -388

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