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0.05(4x)+0.07x=3240
We move all terms to the left:
0.05(4x)+0.07x-(3240)=0
We add all the numbers together, and all the variables
0.124x-3240=0
We move all terms containing x to the left, all other terms to the right
0.124x=3240
x=3240/0.124
x=26129+0.00399999999991/0.124
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