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Simplifying 13 + -7x = 100 + -28x Solving 13 + -7x = 100 + -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 13 + -7x + 28x = 100 + -28x + 28x Combine like terms: -7x + 28x = 21x 13 + 21x = 100 + -28x + 28x Combine like terms: -28x + 28x = 0 13 + 21x = 100 + 0 13 + 21x = 100 Add '-13' to each side of the equation. 13 + -13 + 21x = 100 + -13 Combine like terms: 13 + -13 = 0 0 + 21x = 100 + -13 21x = 100 + -13 Combine like terms: 100 + -13 = 87 21x = 87 Divide each side by '21'. x = 4.142857143 Simplifying x = 4.142857143
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