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Simplifying 4x + 2y + -4 + -3 = 21 Reorder the terms: -4 + -3 + 4x + 2y = 21 Combine like terms: -4 + -3 = -7 -7 + 4x + 2y = 21 Solving -7 + 4x + 2y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 4x + 7 + 2y = 21 + 7 Reorder the terms: -7 + 7 + 4x + 2y = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 4x + 2y = 21 + 7 4x + 2y = 21 + 7 Combine like terms: 21 + 7 = 28 4x + 2y = 28 Add '-2y' to each side of the equation. 4x + 2y + -2y = 28 + -2y Combine like terms: 2y + -2y = 0 4x + 0 = 28 + -2y 4x = 28 + -2y Divide each side by '4'. x = 7 + -0.5y Simplifying x = 7 + -0.5y
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