Apply the distributive property.
Multiply 9 by -10.
Move all terms containing t to the left side of the equation.
Subtract 9t from both sides of the equation.
Subtract 9t from -t.
Divide each term by -10 and simplify.
Divide each term in -10t=-90 by -10.
Cancel the common factor of -10.
Cancel the common factor.
Divide t by 1.
Divide -90 by -10.
Solve for t -t=9(t-10)