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6 steps: (1) 5x + 3 = 2x + 15. Variables on BOTH sides! (2) Goal: get all x-terms on ONE side. Subtract 2x from both: 3x + 3 = 15. (3) Now it's a two-step equation! Subtract 3: 3x = 12. Divide: x = 4. (4) Check: 5(4)+3=23, 2(4)+15=23 ✓. (5) Special case: 3x+5=3x+10. Subtract 3x: 5=10. False! NO SOLU
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