(12*.15x)+(12*.25y)=12*.21

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Solution for (12*.15x)+(12*.25y)=12*.21 equation: 


Simplifying
(12 * 0.15x) + (12 * 0.25y) = 12 * 0.21

Multiply 12 * 0.15
(1.8x) + (12 * 0.25y) = 12 * 0.21

Multiply 12 * 0.25
(1.8x) + (3y) = 12 * 0.21

Multiply 12 * 0.21
(1.8x) + (3y) = 2.52

Solving
(1.8x) + (3y) = 2.52

Solving for variable 'x'.

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

Add '(-3y)' to each side of the equation.
(1.8x) + (3y) + (-3y) = 2.52 + (-3y)

Combine like terms: (3y) + (-3y) = 0
(1.8x) + 0 = 2.52 + (-3y)
(1.8x) = 2.52 + (-3y)

Divide each side by '1.8'.
x = 1.4 + (-1.666666667y)

Simplifying
x = 1.4 + (-1.666666667y)

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