0.05+0.07(100-x)=3.2

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Solution for 0.05+0.07(100-x)=3.2 equation: 


Simplifying
0.05 + 0.07(100 + -1x) = 3.2
0.05 + (100 * 0.07 + -1x * 0.07) = 3.2
0.05 + (7 + -0.07x) = 3.2

Combine like terms: 0.05 + 7 = 7.05
7.05 + -0.07x = 3.2

Solving
7.05 + -0.07x = 3.2

Solving for variable 'x'.

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

Add '-7.05' to each side of the equation.
7.05 + -7.05 + -0.07x = 3.2 + -7.05

Combine like terms: 7.05 + -7.05 = 0.00
0.00 + -0.07x = 3.2 + -7.05
-0.07x = 3.2 + -7.05

Combine like terms: 3.2 + -7.05 = -3.85
-0.07x = -3.85

Divide each side by '-0.07'.
x = 55

Simplifying
x = 55

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