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Simplifying 5x + 7y + -4 = 90 Reorder the terms: -4 + 5x + 7y = 90 Solving -4 + 5x + 7y = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 5x + 4 + 7y = 90 + 4 Reorder the terms: -4 + 4 + 5x + 7y = 90 + 4 Combine like terms: -4 + 4 = 0 0 + 5x + 7y = 90 + 4 5x + 7y = 90 + 4 Combine like terms: 90 + 4 = 94 5x + 7y = 94 Add '-7y' to each side of the equation. 5x + 7y + -7y = 94 + -7y Combine like terms: 7y + -7y = 0 5x + 0 = 94 + -7y 5x = 94 + -7y Divide each side by '5'. x = 18.8 + -1.4y Simplifying x = 18.8 + -1.4y
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