7x+3-5x=15

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Solution for 7x+3-5x=15 equation: 


Simplifying
7x + 3 + -5x = 15

Reorder the terms:
3 + 7x + -5x = 15

Combine like terms: 7x + -5x = 2x
3 + 2x = 15

Solving
3 + 2x = 15

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 2x = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 2x = 15 + -3
2x = 15 + -3

Combine like terms: 15 + -3 = 12
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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