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Simplifying -3x(-5) + -7y = 21 Reorder the terms for easier multiplication: -3 * -5x + -7y = 21 Multiply -3 * -5 15x + -7y = 21 Solving 15x + -7y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7y' to each side of the equation. 15x + -7y + 7y = 21 + 7y Combine like terms: -7y + 7y = 0 15x + 0 = 21 + 7y 15x = 21 + 7y Divide each side by '15'. x = 1.4 + 0.4666666667y Simplifying x = 1.4 + 0.4666666667y
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