0.3x+0.7=0.7x-2.1

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Solution for 0.3x+0.7=0.7x-2.1 equation: 


Simplifying
0.3x + 0.7 = 0.7x + -2.1

Reorder the terms:
0.7 + 0.3x = 0.7x + -2.1

Reorder the terms:
0.7 + 0.3x = -2.1 + 0.7x

Solving
0.7 + 0.3x = -2.1 + 0.7x

Solving for variable 'x'.

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

Add '-0.7x' to each side of the equation.
0.7 + 0.3x + -0.7x = -2.1 + 0.7x + -0.7x

Combine like terms: 0.3x + -0.7x = -0.4x
0.7 + -0.4x = -2.1 + 0.7x + -0.7x

Combine like terms: 0.7x + -0.7x = 0.0
0.7 + -0.4x = -2.1 + 0.0
0.7 + -0.4x = -2.1

Add '-0.7' to each side of the equation.
0.7 + -0.7 + -0.4x = -2.1 + -0.7

Combine like terms: 0.7 + -0.7 = 0.0
0.0 + -0.4x = -2.1 + -0.7
-0.4x = -2.1 + -0.7

Combine like terms: -2.1 + -0.7 = -2.8
-0.4x = -2.8

Divide each side by '-0.4'.
x = 7

Simplifying
x = 7

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