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f(2.5)=4(-2.5)-7
We simplify the equation to the form, which is simple to understand
f(2.5)=4(-2.5)-7
Reorder the terms in parentheses
+(+2.5f)=4*(-2.5)-7
Remove unnecessary parentheses
+2.5f=+4+*(-2.5+)-7
Reorder the terms in parentheses
+2.5f=+(-10)-7
Remove unnecessary parentheses
+2.5f=-10-7
We move all terms containing f to the left and all other terms to the right.
+2.5f=-10-7
We simplify left and right side of the equation.
+2.5f=-17
We divide both sides of the equation by 2.5 to get f.
f=-6.8
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