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Simplifying 18 = 15y + -1(-2x + 21) Reorder the terms: 18 = 15y + -1(21 + -2x) 18 = 15y + (21 * -1 + -2x * -1) 18 = 15y + (-21 + 2x) Reorder the terms: 18 = -21 + 2x + 15y Solving 18 = -21 + 2x + 15y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 18 + -2x = -21 + 2x + -2x + 15y Combine like terms: 2x + -2x = 0 18 + -2x = -21 + 0 + 15y 18 + -2x = -21 + 15y Add '-18' to each side of the equation. 18 + -18 + -2x = -21 + -18 + 15y Combine like terms: 18 + -18 = 0 0 + -2x = -21 + -18 + 15y -2x = -21 + -18 + 15y Combine like terms: -21 + -18 = -39 -2x = -39 + 15y Divide each side by '-2'. x = 19.5 + -7.5y Simplifying x = 19.5 + -7.5y
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