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4y+3x=-12
-2x+y=2|*(-4)
3x+4y=-12
8x-4y=-8
3x+4y=-12
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11x=-20
x=-1⁹/₁₁
y=2*(-1⁹/₁₁)+2
y=-3⁷/₁₁+2
y=-1⁷/₁₁
spr:
4y+3x=-12
4*(-1⁷/₁₁)+3*(-1⁹/₁₁)=-12
-⁷²/₁₁-⁶⁰/₁₁=-12
-¹³²/₁₁=-12
-12=-12