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Mathematics 18 Online
OpenStudy (anonymous):

step 1 7 + 9x - 7 - 3x + 6 = 7 + (9x - 7) - 3x + 6 Step 2 = 7 + (-7 + 9x) - 3x + 6 Step 3 = [7 + (-7)] + (9x - 3x) + 6 Step 4 = 0 + (9x - 3x) + 6 Step 5 = (9x - 3x) + 6 Step 6 = (9 - 3)x + 6 Step 7 = 6x + 6 associative additive identity commutative distributive

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