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Simplifying -90 = 7x + 3x Combine like terms: 7x + 3x = 10x -90 = 10x Solving -90 = 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -90 + -10x = 10x + -10x Combine like terms: 10x + -10x = 0 -90 + -10x = 0 Add '90' to each side of the equation. -90 + 90 + -10x = 0 + 90 Combine like terms: -90 + 90 = 0 0 + -10x = 0 + 90 -10x = 0 + 90 Combine like terms: 0 + 90 = 90 -10x = 90 Divide each side by '-10'. x = -9 Simplifying x = -9
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