0.42(12)+0.07x=0.21(30+x)

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Solution for 0.42(12)+0.07x=0.21(30+x) equation: 


Simplifying
0.42(12) + 0.07x = 0.21(30 + x)

Multiply 0.42 * 12
5.04 + 0.07x = 0.21(30 + x)
5.04 + 0.07x = (30 * 0.21 + x * 0.21)
5.04 + 0.07x = (6.3 + 0.21x)

Solving
5.04 + 0.07x = 6.3 + 0.21x

Solving for variable 'x'.

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

Add '-0.21x' to each side of the equation.
5.04 + 0.07x + -0.21x = 6.3 + 0.21x + -0.21x

Combine like terms: 0.07x + -0.21x = -0.14x
5.04 + -0.14x = 6.3 + 0.21x + -0.21x

Combine like terms: 0.21x + -0.21x = 0.00
5.04 + -0.14x = 6.3 + 0.00
5.04 + -0.14x = 6.3

Add '-5.04' to each side of the equation.
5.04 + -5.04 + -0.14x = 6.3 + -5.04

Combine like terms: 5.04 + -5.04 = 0.00
0.00 + -0.14x = 6.3 + -5.04
-0.14x = 6.3 + -5.04

Combine like terms: 6.3 + -5.04 = 1.26
-0.14x = 1.26

Divide each side by '-0.14'.
x = -9

Simplifying
x = -9

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