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its 10x +9y +1z
25X + 30 = 15X subtract 15X from each side 25X - 15X + 30 = 15X - 15X 10X + 30 = 0 subtract 30 from each side 10X + 30 - 30 = 0 - 30 10X = -30 divide both sides integers by 10 (10/10)X = - 30/10 X = - 3 ----------------check in original equation 25(- 3) + 30 = 15(- 3) - 75 + 30 = - 45 - 45 = - 45 ----------------checks
2x + 3 + 23x = 25x +3
25x + 35x + 9 is 60x + 9, which factors to 3(20x + 3)
25x + 75 = 25*(x + 3)