4*0.3+2*0.3+x*0.4=5

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Solution for 4*0.3+2*0.3+x*0.4=5 equation: 


Simplifying
4 * 0.3 + 2 * 0.3 + x * 0.4 = 5

Multiply 4 * 0.3
1.2 + 2 * 0.3 + x * 0.4 = 5

Multiply 2 * 0.3
1.2 + 0.6 + x * 0.4 = 5

Reorder the terms for easier multiplication:
1.2 + 0.6 + 0.4x = 5

Combine like terms: 1.2 + 0.6 = 1.8
1.8 + 0.4x = 5

Solving
1.8 + 0.4x = 5

Solving for variable 'x'.

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

Add '-1.8' to each side of the equation.
1.8 + -1.8 + 0.4x = 5 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + 0.4x = 5 + -1.8
0.4x = 5 + -1.8

Combine like terms: 5 + -1.8 = 3.2
0.4x = 3.2

Divide each side by '0.4'.
x = 8

Simplifying
x = 8

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