x + (x - 12.6) = 65.4
x + x - 12.6 = 65.4
2 x - 12.6 = 65.4
2 x = 65.4 + 12.6
2 x = 78
x = 78 : 2
x = 39
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x + (x - 12.6) = 65.4
x + x - 12.6 = 65.4
2 x - 12.6 = 65.4
2 x = 65.4 + 12.6
2 x = 78
x = 78 : 2
x = 39