Simplifying 25 + x + 15 = 3x + -10 Reorder the terms: 25 + 15 + x = 3x + -10 Combine like terms: 25 + 15 = 40 40 + x = 3x + -10 Reorder the terms: 40 + x = -10 + 3x Solving 40 + x = -10 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 40 + x + -3x = -10 + 3x + -3x Combine like terms: x + -3x = -2x 40 + -2x = -10 + 3x + -3x Combine like terms: 3x + -3x = 0 40 + -2x = -10 + 0 40 + -2x = -10 Add '-40' to each side of the equation. 40 + -40 + -2x = -10 + -40 Combine like terms: 40 + -40 = 0 0 + -2x = -10 + -40 -2x = -10 + -40 Combine like terms: -10 + -40 = -50 -2x = -50 Divide each side by '-2'. x = 25 Simplifying x = 25