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SOMEONE PLEASE HELP IVE BEEN STUCK FOR 3 HOURS

Multiply the 2nd equation by -4. What value belongs in the green box? -2x + 4y = 15 -2x + 4y = 15 (3x + y = 2) multiply by 4 [?] + [?] = [?] A. 3x B. -12x C. 12x D. -X​