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-45=10a-4-49a+49
We simplify the equation to the form, which is simple to understand
-45=10a-4-49a+49
We move all terms containing a to the left and all other terms to the right.
-10a+49a=-4+49+45
We simplify left and right side of the equation.
+39a=+90
We divide both sides of the equation by 39 to get a.
a=2.3076923076923
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