0.7x-0.7(3-x)=4.2

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Solution for 0.7x-0.7(3-x)=4.2 equation: 


Simplifying
0.7x + -0.7(3 + -1x) = 4.2
0.7x + (3 * -0.7 + -1x * -0.7) = 4.2
0.7x + (-2.1 + 0.7x) = 4.2

Reorder the terms:
-2.1 + 0.7x + 0.7x = 4.2

Combine like terms: 0.7x + 0.7x = 1.4x
-2.1 + 1.4x = 4.2

Solving
-2.1 + 1.4x = 4.2

Solving for variable 'x'.

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

Add '2.1' to each side of the equation.
-2.1 + 2.1 + 1.4x = 4.2 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + 1.4x = 4.2 + 2.1
1.4x = 4.2 + 2.1

Combine like terms: 4.2 + 2.1 = 6.3
1.4x = 6.3

Divide each side by '1.4'.
x = 4.5

Simplifying
x = 4.5

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