0.7+1.3x+0.5x=7.9

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Solution for 0.7+1.3x+0.5x=7.9 equation: 


Simplifying
0.7 + 1.3x + 0.5x = 7.9

Combine like terms: 1.3x + 0.5x = 1.8x
0.7 + 1.8x = 7.9

Solving
0.7 + 1.8x = 7.9

Solving for variable 'x'.

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

Add '-0.7' to each side of the equation.
0.7 + -0.7 + 1.8x = 7.9 + -0.7

Combine like terms: 0.7 + -0.7 = 0.0
0.0 + 1.8x = 7.9 + -0.7
1.8x = 7.9 + -0.7

Combine like terms: 7.9 + -0.7 = 7.2
1.8x = 7.2

Divide each side by '1.8'.
x = 4

Simplifying
x = 4

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