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(1)移項得,3x-5x=-8-4,合併同類項得,-2x=-12,係數化為1得,x=6;(2)去括弧得,2x-20+5x=3x-6,移項得,2x-5x-3x=-6+20,合併同類項得,-6x=14,係數化為1得,x=-73.
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