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7.8+2(0.75x+0.4)=6.4x+4(0.5-0.8)
We move all terms to the left:
7.8+2(0.75x+0.4)-(6.4x+4(0.5-0.8))=0
We add all the numbers together, and all the variables
2(0.75x+0.4)-(6.4x+4(-0.3))+7.8=0
We multiply parentheses
0x-(6.4x+4(-0.3))+0.8+7.8=0
We calculate terms in parentheses: -(6.4x+4(-0.3)), so:We add all the numbers together, and all the variables
6.4x+4(-0.3)
We add all the numbers together, and all the variables
6.4x-1.2
Back to the equation:
-(6.4x-1.2)
x-(6.4x-1.2)+8.6=0
We get rid of parentheses
x-6.4x+1.2+8.6=0
We add all the numbers together, and all the variables
-5.4x+9.8=0
We move all terms containing x to the left, all other terms to the right
-5.4x=-9.8
x=-9.8/-5.4
x=1+3.1428571428571/3.8571428571429
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