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Mathematics 7 Online
OpenStudy (anonymous):

Step 1 12 + 11x - 12 - 4x + 3 = 12 + (11x - 12) - 4x + 3 Step 2 = 12 + (-12 + 11x) - 4x + 3 Step 3 = [12 + (-12)] + (11x - 4x) + 3 Step 4 = 0 + (11x - 4x) + 3 Step 5 = (11x - 4x) + 3 Step 6 = (11 - 4)x + 3 Step 7 = 7x + 3

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