7 - 3 ( 5t - 10 ) = 67
\(7-3(5t-10)=67\)\(7-(3*5t-3*10)=67\)\(7-15t-(-30)=67\)\(7-15t+30=67\)\(-15t=67-30-7\)\(-15t=30\)then...\(t=-\frac{30}{15}\)\(\boxed{\boxed{t=-2}}\)
Answer in an annex....................................
