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Simplifying 3x + 90 = 7x + 138 Reorder the terms: 90 + 3x = 7x + 138 Reorder the terms: 90 + 3x = 138 + 7x Solving 90 + 3x = 138 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 90 + 3x + -7x = 138 + 7x + -7x Combine like terms: 3x + -7x = -4x 90 + -4x = 138 + 7x + -7x Combine like terms: 7x + -7x = 0 90 + -4x = 138 + 0 90 + -4x = 138 Add '-90' to each side of the equation. 90 + -90 + -4x = 138 + -90 Combine like terms: 90 + -90 = 0 0 + -4x = 138 + -90 -4x = 138 + -90 Combine like terms: 138 + -90 = 48 -4x = 48 Divide each side by '-4'. x = -12 Simplifying x = -12
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