.75*a+.40*b=400

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Solution for .75*a+.40*b=400 equation: 


Simplifying
0.75a + 0.40b = 400

Solving
0.75a + 0.40b = 400

Solving for variable 'a'.

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

Add '-0.40b' to each side of the equation.
0.75a + 0.40b + -0.40b = 400 + -0.40b

Combine like terms: 0.40b + -0.40b = 0.00
0.75a + 0.00 = 400 + -0.40b
0.75a = 400 + -0.40b

Divide each side by '0.75'.
a = 533.3333333 + -0.5333333333b

Simplifying
a = 533.3333333 + -0.5333333333b

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