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90=19x+4.5
We move all terms to the left:
90-(19x+4.5)=0
We get rid of parentheses
-19x-4.5+90=0
We add all the numbers together, and all the variables
-19x+85.5=0
We move all terms containing x to the left, all other terms to the right
-19x=-85.5
x=-85.5/-19
x=4+6.3333333333333/12.666666666667
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