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Mathematics, 01.09.2019 00:50 wolfsaway

Indicate which property is illustrated in step 3.
step 1= 12 + 9x - 12 - 4x + 3 = 12 + (9x - 12) - 4x + 3
step 2 = 12 + (-12 + 9x) - 4x + 3
step 3 = [12 + (-12)] + (9x - 4x) + 3
step 4 = 0 + (9x - 4x) + 3
step 5 = (9x - 4x) + 3
step 6 = (9 - 4)x + 3
step 7 = 5x + 3

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Indicate which property is illustrated in step 3.
step 1= 12 + 9x - 12 - 4x + 3 = 12 + (9x - 1...
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