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Simplifying 3x + -5(2x + 7) + -5y = -21 Reorder the terms: 3x + -5(7 + 2x) + -5y = -21 3x + (7 * -5 + 2x * -5) + -5y = -21 3x + (-35 + -10x) + -5y = -21 Reorder the terms: -35 + 3x + -10x + -5y = -21 Combine like terms: 3x + -10x = -7x -35 + -7x + -5y = -21 Solving -35 + -7x + -5y = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + -7x + 35 + -5y = -21 + 35 Reorder the terms: -35 + 35 + -7x + -5y = -21 + 35 Combine like terms: -35 + 35 = 0 0 + -7x + -5y = -21 + 35 -7x + -5y = -21 + 35 Combine like terms: -21 + 35 = 14 -7x + -5y = 14 Add '5y' to each side of the equation. -7x + -5y + 5y = 14 + 5y Combine like terms: -5y + 5y = 0 -7x + 0 = 14 + 5y -7x = 14 + 5y Divide each side by '-7'. x = -2 + -0.7142857143y Simplifying x = -2 + -0.7142857143y
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