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154 = 7*x+5*x+10 // - 7*x+5*x+10
154-(7*x)-(5*x)-10 = 0
154-7*x-5*x-10 = 0
144-12*x = 0 // - 144
-12*x = -144 // : -12
x = -144/(-12)
x = 12
x = 12
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