.4x+.7y=.5*20

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Solution for .4x+.7y=.5*20 equation: 


Simplifying
0.4x + 0.7y = 0.5 * 20

Multiply 0.5 * 20
0.4x + 0.7y = 10

Solving
0.4x + 0.7y = 10

Solving for variable 'x'.

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

Add '-0.7y' to each side of the equation.
0.4x + 0.7y + -0.7y = 10 + -0.7y

Combine like terms: 0.7y + -0.7y = 0.0
0.4x + 0.0 = 10 + -0.7y
0.4x = 10 + -0.7y

Divide each side by '0.4'.
x = 25 + -1.75y

Simplifying
x = 25 + -1.75y

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