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Simplifying 21(4) + 18 = x Multiply 21 * 4 84 + 18 = x Combine like terms: 84 + 18 = 102 102 = x Solving 102 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 102 + -1x = x + -1x Combine like terms: x + -1x = 0 102 + -1x = 0 Add '-102' to each side of the equation. 102 + -102 + -1x = 0 + -102 Combine like terms: 102 + -102 = 0 0 + -1x = 0 + -102 -1x = 0 + -102 Combine like terms: 0 + -102 = -102 -1x = -102 Divide each side by '-1'. x = 102 Simplifying x = 102
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