x + 5 = 12, Solve by subtracting 5 from both sides to isolate x, 3y − 4 = 11, Add 4 to both sides, then divide by 3, y = 2x + 1, Graphs as a straight line; infinite solutions as pairs (x, y)., x = 7, Already solved, 2a = 10, Divide both sides by 2

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