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11(6.40+4.80+x)=128.15
We move all terms to the left:
11(6.40+4.80+x)-(128.15)=0
We add all the numbers together, and all the variables
11(x+11.2)-(128.15)=0
We add all the numbers together, and all the variables
11(x+11.2)-128.15=0
We multiply parentheses
11x+123.2-128.15=0
We add all the numbers together, and all the variables
11x-4.95=0
We move all terms containing x to the left, all other terms to the right
11x=4.95
x=4.95/11
x=2.5384615384615/5.6410256410256
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