Constructing Math

The result is x = 2. Checking the solution can be done by substituting the solution into the original problem for all the x-values. This gives us 4(2) + 3 = -5(2) + 21. Doing further work yields 8 + 3 = -10 + 21 and finally 11 = 11. Therefore the solution x = 2 is the correct solution. ................
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