Solution equation: x-0.2x = 16

Solution equation: x-0.2x = 16

x-0.2x=16
0.8x=16
x=16÷0.8
x=20
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2x-3.5 × 4 = 16 solution equation

2x-14=16-14

4 (x-3 / 4) = 16 solutions
X-4 / 9 = 7 / 9
(x + 6 / 7) * 2 = 4

4 (x-3 / 4) = 16
x-3/4=4
x=4+3/4
X = 4 and 3 / 4
X-4 / 9 = 7 / 9
x=7/9+4/9
x=11/9
(x + 6 / 7) * 2 = 4
x+6/7=2
x=2-6/7
x=8/7
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Solve the system of linear equations with three variables {x + y = 16, y + Z = 17, x + Z = 18

X + y = 16, ① y + Z = 17, ② x + Z = 18, ③ - ② get X-Y = 1, ④ + ① get x = 17 / 2, substitute ④'s y = 15 / 2, substitute ② get z = 19 / 2