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Simplifying 20y + -15x + 2x + 10y + 21 = 180 Reorder the terms: 21 + -15x + 2x + 20y + 10y = 180 Combine like terms: -15x + 2x = -13x 21 + -13x + 20y + 10y = 180 Combine like terms: 20y + 10y = 30y 21 + -13x + 30y = 180 Solving 21 + -13x + 30y = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -13x + -21 + 30y = 180 + -21 Reorder the terms: 21 + -21 + -13x + 30y = 180 + -21 Combine like terms: 21 + -21 = 0 0 + -13x + 30y = 180 + -21 -13x + 30y = 180 + -21 Combine like terms: 180 + -21 = 159 -13x + 30y = 159 Add '-30y' to each side of the equation. -13x + 30y + -30y = 159 + -30y Combine like terms: 30y + -30y = 0 -13x + 0 = 159 + -30y -13x = 159 + -30y Divide each side by '-13'. x = -12.23076923 + 2.307692308y Simplifying x = -12.23076923 + 2.307692308y
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