Simplifying 
7 + -4.9t = 15 + 7.6t 
Solving 
7 + -4.9t = 15 + 7.6t 
Solving for variable 't'. 
Move all terms containing t to the left, all other terms to the right. 
Add '-7.6t' to each side of the equation. 
7 + -4.9t + -7.6t = 15 + 7.6t + -7.6t 
Combine like terms: -4.9t + -7.6t = -12.5t 
7 + -12.5t = 15 + 7.6t + -7.6t 
Combine like terms: 7.6t + -7.6t = 0.0 
7 + -12.5t = 15 + 0.0 
7 + -12.5t = 15 
Add '-7' to each side of the equation. 
7 + -7 + -12.5t = 15 + -7 
Combine like terms: 7 + -7 = 0 
0 + -12.5t = 15 + -7 
-12.5t = 15 + -7 
Combine like terms: 15 + -7 = 8 
-12.5t = 8 
Divide each side by '-12.5'. 
t = -0.64 
Simplifying 
t = -0.64