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Simplifying 3x + 4 + -7x + y = 90 Reorder the terms: 4 + 3x + -7x + y = 90 Combine like terms: 3x + -7x = -4x 4 + -4x + y = 90 Solving 4 + -4x + y = 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 + -4x + -4 + y = 90 + -4 Reorder the terms: 4 + -4 + -4x + y = 90 + -4 Combine like terms: 4 + -4 = 0 0 + -4x + y = 90 + -4 -4x + y = 90 + -4 Combine like terms: 90 + -4 = 86 -4x + y = 86 Add '-1y' to each side of the equation. -4x + y + -1y = 86 + -1y Combine like terms: y + -1y = 0 -4x + 0 = 86 + -1y -4x = 86 + -1y Divide each side by '-4'. x = -21.5 + 0.25y Simplifying x = -21.5 + 0.25y
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