(308+х)-112=408
308+х=408+112
308+х=520
х=520-308
х=212
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(308+х)-112=408
308+х=408+112
308+х=520
х=520-308
х=212
308 + х = 112 + 408
308 + х = 520
х = 520 - 308
х = 212
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(308 + 212) - 112 = 408
408 = 408