Subtract 7 from both sides then divide both side by 2, 2x + 7 = 15, Add 5 to both sides then divide both sides by 6, 6x - 5 = 7, Subtract 5 from both sides then multiply both sides by 4, x/4 + 5 = 8, Add 7 to both sides then multiply both sides by 2, x/2 - 7 = 8, Subtract 5 from both sides then divide both sides by 4, 4x + 5 = 25, Add 5 to both sides then multiply both sides by 6, x/6 - 5 = 1, Subtract 7 from both sides then multiply both sides by 2, x/2 + 7 = 17, Add 5 to both sides then divide both sides by 4, 4x -5 = 23.

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