.25+.05(20-x)=.21(20)

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Solution for .25+.05(20-x)=.21(20) equation:


Simplifying
0.25 + 0.05(20 + -1x) = 0.21(20)
0.25 + (20 * 0.05 + -1x * 0.05) = 0.21(20)
0.25 + (1 + -0.05x) = 0.21(20)

Combine like terms: 0.25 + 1 = 1.25
1.25 + -0.05x = 0.21(20)

Multiply 0.21 * 20
1.25 + -0.05x = 4.2

Solving
1.25 + -0.05x = 4.2

Solving for variable 'x'.

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

Add '-1.25' to each side of the equation.
1.25 + -1.25 + -0.05x = 4.2 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -0.05x = 4.2 + -1.25
-0.05x = 4.2 + -1.25

Combine like terms: 4.2 + -1.25 = 2.95
-0.05x = 2.95

Divide each side by '-0.05'.
x = -59

Simplifying
x = -59

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