.1+.15(20+x)=.12(20)

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Solution for .1+.15(20+x)=.12(20) equation: 


Simplifying
0.1 + 0.15(20 + x) = 0.12(20)
0.1 + (20 * 0.15 + x * 0.15) = 0.12(20)
0.1 + (3 + 0.15x) = 0.12(20)

Combine like terms: 0.1 + 3 = 3.1
3.1 + 0.15x = 0.12(20)

Multiply 0.12 * 20
3.1 + 0.15x = 2.4

Solving
3.1 + 0.15x = 2.4

Solving for variable 'x'.

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

Add '-3.1' to each side of the equation.
3.1 + -3.1 + 0.15x = 2.4 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 0.15x = 2.4 + -3.1
0.15x = 2.4 + -3.1

Combine like terms: 2.4 + -3.1 = -0.7
0.15x = -0.7

Divide each side by '0.15'.
x = -4.666666667

Simplifying
x = -4.666666667

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