2*(-1.5a - 2.8) + 4.2a - 6 = -3a - 5.6 + 4.2a - 6 = 1.2a - 11.6
a=-3/4
1.2 * (-3/4) - 11.6 = -0.9 - 11.6 = -12.5
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2*(-1.5a - 2.8) + 4.2a - 6 = -3a - 5.6 + 4.2a - 6 = 1.2a - 11.6
a=-3/4
1.2 * (-3/4) - 11.6 = -0.9 - 11.6 = -12.5