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Simplifying 4(x + 3y + -21) = 0 Reorder the terms: 4(-21 + x + 3y) = 0 (-21 * 4 + x * 4 + 3y * 4) = 0 (-84 + 4x + 12y) = 0 Solving -84 + 4x + 12y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 4x + 84 + 12y = 0 + 84 Reorder the terms: -84 + 84 + 4x + 12y = 0 + 84 Combine like terms: -84 + 84 = 0 0 + 4x + 12y = 0 + 84 4x + 12y = 0 + 84 Combine like terms: 0 + 84 = 84 4x + 12y = 84 Add '-12y' to each side of the equation. 4x + 12y + -12y = 84 + -12y Combine like terms: 12y + -12y = 0 4x + 0 = 84 + -12y 4x = 84 + -12y Divide each side by '4'. x = 21 + -3y Simplifying x = 21 + -3y
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