5/7(21y+7)=2/9(18x+27
⁵/₇(21y + 7) = ²/₉(18x + 27)⁵/₇(21y) + ⁵/₇(7) = ²/₉(18x) + ²/₉(27) 15y + 5 = 4x + 6 - 5 - 5 15y = 4x + 1 15 15 y = ⁴/₁₅x + ¹/₁₅