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