-75+4x+3x=30

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Solution for -75+4x+3x=30 equation: 


Simplifying
-75 + 4x + 3x = 30

Combine like terms: 4x + 3x = 7x
-75 + 7x = 30

Solving
-75 + 7x = 30

Solving for variable 'x'.

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

Add '75' to each side of the equation.
-75 + 75 + 7x = 30 + 75

Combine like terms: -75 + 75 = 0
0 + 7x = 30 + 75
7x = 30 + 75

Combine like terms: 30 + 75 = 105
7x = 105

Divide each side by '7'.
x = 15

Simplifying
x = 15

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