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Simplifying 90 + -3x + 15 = 4x Reorder the terms: 90 + 15 + -3x = 4x Combine like terms: 90 + 15 = 105 105 + -3x = 4x Solving 105 + -3x = 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 105 + -3x + -4x = 4x + -4x Combine like terms: -3x + -4x = -7x 105 + -7x = 4x + -4x Combine like terms: 4x + -4x = 0 105 + -7x = 0 Add '-105' to each side of the equation. 105 + -105 + -7x = 0 + -105 Combine like terms: 105 + -105 = 0 0 + -7x = 0 + -105 -7x = 0 + -105 Combine like terms: 0 + -105 = -105 -7x = -105 Divide each side by '-7'. x = 15 Simplifying x = 15
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