If -0.25x + 1.3 = -0.55x - 0.2 , then x.
-5
-2
2
5
Find the value of x:0.5x+x3=0.25x+7
Solve the equation by substitution method
0.2x+0.3y=1.3
0.4x+0.5y=2.3
(2.5×0.5)+(1.3×0.3)−(1.4×0.2) = _____