7=0.3x-0.4x-3

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Solution for 7=0.3x-0.4x-3 equation: 


Simplifying
7 = 0.3x + -0.4x + -3

Reorder the terms:
7 = -3 + 0.3x + -0.4x

Combine like terms: 0.3x + -0.4x = -0.1x
7 = -3 + -0.1x

Solving
7 = -3 + -0.1x

Solving for variable 'x'.

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

Add '0.1x' to each side of the equation.
7 + 0.1x = -3 + -0.1x + 0.1x

Combine like terms: -0.1x + 0.1x = 0.0
7 + 0.1x = -3 + 0.0
7 + 0.1x = -3

Add '-7' to each side of the equation.
7 + -7 + 0.1x = -3 + -7

Combine like terms: 7 + -7 = 0
0 + 0.1x = -3 + -7
0.1x = -3 + -7

Combine like terms: -3 + -7 = -10
0.1x = -10

Divide each side by '0.1'.
x = -100

Simplifying
x = -100

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