( - 5x {2}^{2} + 6x + 7 ) - ( - x + 4x) =
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= (-5x + 6x + 7 {2}^{2}) - (-x + 4×)
= x + 7 {2}^{2} - 3x
= -2x + 7 (4)
= -2x + 28
= x = 14
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Answer:
Step-by-step explanation:
4-5
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