3m - Simplify m+m+m, 7b-28 - Expand 7(b-4), 4a(3c - 1) - Factorise 12ac - 4a, 6 - Solve 2x+7=19, 2d-3e+26 - Expand and simplify 2(d+4)-3(e-6), 4 - Solve 6x+4=2x+12,

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