Solve the equation $3\left(2x+1\right)=15$3(2x+1)=15.
Enter each line of working as an equation.
Solve the equation $3\left(4s+1\right)=-21$3(4s+1)=−21.
Solve the equation $2\left(3t-7\right)=16$2(3t−7)=16.
Solve the equation $-5\left(3x+8\right)=-10$−5(3x+8)=−10.