Use algebra.
12x+30=15x-20. Add 20 to both sides.
12x+50=15x. Subtract 12x from both sides.
50=3x. Divide both sides by 3.
16.666...=x
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30+12x = 6(5+2x)
12x-30=114 12x=114+30 x=144 / 12 therefore x=12
2x2 + 6 = 30 is your statement.2x2 = 24x2 = 12x = ±√12x = ±√(4*3)x = 2√3 or x = -2√3
12x - 5(2x - 6) = 30 12 x - 10x + 30 = 30 2x = 0, x = 0 y = -6
y = 5 - 2x so 4x + 6(5 - 2x) = -2 ie 4x + 30 - 12x = -2 Subtract 30 from each side: 4x - 12x = -32 ie -8x = -32 so x = 4 and y = -3