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Simplifying 21 + -4x = -81 + -7x Solving 21 + -4x = -81 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 21 + -4x + 7x = -81 + -7x + 7x Combine like terms: -4x + 7x = 3x 21 + 3x = -81 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 3x = -81 + 0 21 + 3x = -81 Add '-21' to each side of the equation. 21 + -21 + 3x = -81 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -81 + -21 3x = -81 + -21 Combine like terms: -81 + -21 = -102 3x = -102 Divide each side by '3'. x = -34 Simplifying x = -34
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