首先是式子应该是100(34-x)+60x=100(38-(3x-2))+60(3x-2)
则得出的是3400-100x+60x=3800-100(3x-2)+60(3x-2)
接着是3400-40x=3800-40(3x-2)
接着是40(3x-2)-40x=400
接着120x-40x-80=400
接着80x=480
x=6


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