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Simplifying -13x + -6x + 7 = -9x + 87 Reorder the terms: 7 + -13x + -6x = -9x + 87 Combine like terms: -13x + -6x = -19x 7 + -19x = -9x + 87 Reorder the terms: 7 + -19x = 87 + -9x Solving 7 + -19x = 87 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 7 + -19x + 9x = 87 + -9x + 9x Combine like terms: -19x + 9x = -10x 7 + -10x = 87 + -9x + 9x Combine like terms: -9x + 9x = 0 7 + -10x = 87 + 0 7 + -10x = 87 Add '-7' to each side of the equation. 7 + -7 + -10x = 87 + -7 Combine like terms: 7 + -7 = 0 0 + -10x = 87 + -7 -10x = 87 + -7 Combine like terms: 87 + -7 = 80 -10x = 80 Divide each side by '-10'. x = -8 Simplifying x = -8
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