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2.1x-1.6(x-2.13)=7.5
We move all terms to the left:
2.1x-1.6(x-2.13)-(7.5)=0
We add all the numbers together, and all the variables
2.1x-1.6(x-2.13)-7.5=0
We multiply parentheses
2.1x-1.6x+3.408-7.5=0
We add all the numbers together, and all the variables
0.5x-4.092=0
We move all terms containing x to the left, all other terms to the right
0.5x=4.092
x=4.092/0.5
x=8+0.092/0.5
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