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7.8+(0.75m+0.4)=-6.4m+4(0.5m-0.8
We move all terms to the left:
7.8+(0.75m+0.4)-(-6.4m+4(0.5m-0.8)=0
We get rid of parentheses
0.75m-(-6.4m+4(0.5m-0.8)+7.8+0.4=0
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