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1 + 7y = 5x - 2 7y = 5x - 3 - 5x = - 7y - 3 x = 7/5y + 3/5 ---------------------
5y explanaition 5x-5x=0, 0-2y=-2y, -2y+7y=5y
i dont know
25x2-49y2 is the difference of two squares and can be factored as:- (5x-7y)(5x+7y)
if: 2x + 6 = -6 then: 2x = -12 x = -6 if: 5x + 7y = 1 then: 5(-6) + 7y = 1 7y = 31 y = 31/7