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-4 + 2x = x + 9
-4 + 2x = 9 + x
Resuelta -4 + 2x = 9 + x
-4 + 2x + -1x = 9 + x + -1x
2x + -1x = 1x -4 + 1x = 9 + x + -1x
x + -1x = 0 -4 + 1x = 9 + 0 -4 + 1x = 9
Añades '4' -4 + 4 + 1x = 9 + 4
-4 + 4 = 0 0 + 1x = 9 + 4 1x = 9 + 4
9 + 4 = 13 1x = 13
1'. x = 13 Simplifying x = 13