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4x(.1)+x(.05)=62.1
We move all terms to the left:
4x(.1)+x(.05)-(62.1)=0
We add all the numbers together, and all the variables
4x(0.1)+x(0.05)-(62.1)=0
We add all the numbers together, and all the variables
4x(0.1)+x(0.05)-62.1=0
We multiply parentheses
0.4x+0.05x-62.1=0
We add all the numbers together, and all the variables
0.45x-62.1=0
We move all terms containing x to the left, all other terms to the right
0.45x=62.1
x=62.1/0.45
x=138
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