X = 4
Explanation
Rearrange unknown terms to the left side of the equation: -3x + 10x = 30 - 2
Combine like terms: 7x = 30 - 2
Calculate the sum or difference: 7x = 28
Divide both sides of the equation by the coefficient of variable: x = 28 / 7
Cross out the common factor: x = 4
Answer: x = 4