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Solve equation 100-4a = 28
100 - 4A = 28
4A = 100 - 28
4A = 72
A = 18
How to solve 3A + 4A and 1.4 equation?
3a+4a=1.4
7a=1.4
a=0.2
Solving the equation, 3a × (- 4A + 24) = 60
The formula method and the collocation method have been calculated once. I regard - as + in the discriminant
3a×（-4a+24）=60
-12a^2+72a-60=0
a^2-6a+5=0
(a-5)(a-1）=0
A = 5 or a = 1
Solving equation (X-7) 4A = (x-3) 3A
(X-7)4a=(X-3)3a
4ax-28a=3ax-9a
ax=19a
x=19a/a=19
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