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Simplifying -21 = 4x + 19 + -1(-6x) Remove parenthesis around (-6x) -21 = 4x + 19 + -1 * -6x Multiply -1 * -6 -21 = 4x + 19 + 6x Reorder the terms: -21 = 19 + 4x + 6x Combine like terms: 4x + 6x = 10x -21 = 19 + 10x Solving -21 = 19 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -21 + -10x = 19 + 10x + -10x Combine like terms: 10x + -10x = 0 -21 + -10x = 19 + 0 -21 + -10x = 19 Add '21' to each side of the equation. -21 + 21 + -10x = 19 + 21 Combine like terms: -21 + 21 = 0 0 + -10x = 19 + 21 -10x = 19 + 21 Combine like terms: 19 + 21 = 40 -10x = 40 Divide each side by '-10'. x = -4 Simplifying x = -4
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