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d+2(21)=49(6)
We simplify the equation to the form, which is simple to understand
d+2(21)=49(6)
Reorder the terms in parentheses
d+(+42)=49*(6)
Remove unnecessary parentheses
+d+42=+49+*(+6+)
Reorder the terms in parentheses
d+42=+(+294)
Remove unnecessary parentheses
+d+42=+294
We move all terms containing d to the left and all other terms to the right.
+1d=+294-42
We simplify left and right side of the equation.
+1d=+252
We divide both sides of the equation by 1 to get d.
d=252
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