x=6
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7x + 9 = 51 7x = 42 x = 42/7 = 6
35
-7x = -42 7x = 42 x = 6
6 + 7x = -36 first, subtract 6 from both sides 7x = -42 then, divide both sides by 7 7x/7 = -42/7 x = -6 to check, put -6 back into the original equation: 6 + (7 x -6) = -36 6 - 42 = -36
6