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4y+21y-18=0
We simplify the equation to the form, which is simple to understand
4y+21y-18=0
We move all terms containing y to the left and all other terms to the right.
+4y+21y=0+18
We simplify left and right side of the equation.
+25y=+18
We divide both sides of the equation by 25 to get y.
y=0.72
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