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2x + 1/2x + 1/4x + 1 = 100 / -1
2x + 1/2x + 1/4x = 99 / *2
4x + x + 1/2x = 198
5 1/2x = 198 / : 5 1/2
11/2x * 2/11 = 198 * 2/11
x = 36