12x+(300-A)=4140

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Solution for 12x+(300-A)=4140 equation:


Simplifying
12x + (300 + -1A) = 4140

Remove parenthesis around (300 + -1A)
12x + 300 + -1A = 4140

Reorder the terms:
300 + -1A + 12x = 4140

Solving
300 + -1A + 12x = 4140

Solving for variable 'A'.

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

Add '-300' to each side of the equation.
300 + -1A + -300 + 12x = 4140 + -300

Reorder the terms:
300 + -300 + -1A + 12x = 4140 + -300

Combine like terms: 300 + -300 = 0
0 + -1A + 12x = 4140 + -300
-1A + 12x = 4140 + -300

Combine like terms: 4140 + -300 = 3840
-1A + 12x = 3840

Add '-12x' to each side of the equation.
-1A + 12x + -12x = 3840 + -12x

Combine like terms: 12x + -12x = 0
-1A + 0 = 3840 + -12x
-1A = 3840 + -12x

Divide each side by '-1'.
A = -3840 + 12x

Simplifying
A = -3840 + 12x

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