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