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Simplifying 4(x + -3) + y = 21 Reorder the terms: 4(-3 + x) + y = 21 (-3 * 4 + x * 4) + y = 21 (-12 + 4x) + y = 21 Solving -12 + 4x + y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 4x + 12 + y = 21 + 12 Reorder the terms: -12 + 12 + 4x + y = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 4x + y = 21 + 12 4x + y = 21 + 12 Combine like terms: 21 + 12 = 33 4x + y = 33 Add '-1y' to each side of the equation. 4x + y + -1y = 33 + -1y Combine like terms: y + -1y = 0 4x + 0 = 33 + -1y 4x = 33 + -1y Divide each side by '4'. x = 8.25 + -0.25y Simplifying x = 8.25 + -0.25y
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