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x² + 6x =315
x² + 6x - 315 = 0
x ↓ +21=-15x x+21=0 x-15=0
x ↓ -15=+21x x=-21 x=15
↓ ⁻⁻⁻⁻⁻⁻⁻
→→→ +6x
Lados: x y x+6
15 y 15+6
15 y 21