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Simplifying 3(2x + -1) + x = 18 + 7(x + -3) Reorder the terms: 3(-1 + 2x) + x = 18 + 7(x + -3) (-1 * 3 + 2x * 3) + x = 18 + 7(x + -3) (-3 + 6x) + x = 18 + 7(x + -3) Combine like terms: 6x + x = 7x -3 + 7x = 18 + 7(x + -3) Reorder the terms: -3 + 7x = 18 + 7(-3 + x) -3 + 7x = 18 + (-3 * 7 + x * 7) -3 + 7x = 18 + (-21 + 7x) Combine like terms: 18 + -21 = -3 -3 + 7x = -3 + 7x Add '3' to each side of the equation. -3 + 3 + 7x = -3 + 3 + 7x Combine like terms: -3 + 3 = 0 0 + 7x = -3 + 3 + 7x 7x = -3 + 3 + 7x Combine like terms: -3 + 3 = 0 7x = 0 + 7x 7x = 7x Add '-7x' to each side of the equation. 7x + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 7x + -7x Combine like terms: 7x + -7x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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