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1-.7b=.4-.5(2b+9)+.3b
We simplify the equation to the form, which is simple to understand
1-.7b=.4-.5(2b+9)+.3b
Reorder the terms in parentheses
1-.7b=.4+(-1b-4.5)+.3b
Remove unnecessary parentheses
+1-.7b=+.4-1b-4.5+.3b
We move all terms containing b to the left and all other terms to the right.
-0.7b+1b-0.3b=0.4-4.5-1
We simplify left and right side of the equation.
+5.55111512313E-17b=-5.1
We divide both sides of the equation by 5.55111512313E-17 to get b.
b=-9.18734323984E+16
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