--7-2x=14
3x+8-4x-12+6X=-19
(9x^5-5x^3)/3x
3x+8-4x-12=6x=-19
-7-2x=14
x+7y-21=0
x^2-2x-4 = y
2*4
-3a - 3b + 16c = -5
9a+3b-8c = -13
-a-b+8c = 1
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