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Simplifying 7 = 5x + 3(x + -3) Reorder the terms: 7 = 5x + 3(-3 + x) 7 = 5x + (-3 * 3 + x * 3) 7 = 5x + (-9 + 3x) Reorder the terms: 7 = -9 + 5x + 3x Combine like terms: 5x + 3x = 8x 7 = -9 + 8x Solving 7 = -9 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 7 + -8x = -9 + 8x + -8x Combine like terms: 8x + -8x = 0 7 + -8x = -9 + 0 7 + -8x = -9 Add '-7' to each side of the equation. 7 + -7 + -8x = -9 + -7 Combine like terms: 7 + -7 = 0 0 + -8x = -9 + -7 -8x = -9 + -7 Combine like terms: -9 + -7 = -16 -8x = -16 Divide each side by '-8'. x = 2 Simplifying x = 2
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